717 lines
21 KiB
JavaScript
717 lines
21 KiB
JavaScript
var _ = require('underscore');
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var BaseWidget = require('./base');
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var debug = require('debug')('windshaft:dataview:histogram');
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var dot = require('dot');
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dot.templateSettings.strip = false;
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var columnCastTpl = dot.template("date_part('epoch', {{=it.column}})");
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var dateIntervalQueryTpl = dot.template([
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'WITH',
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'dates AS (',
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' SELECT',
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' MAX({{=it.column}}::timestamp) AS _end,',
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' MIN({{=it.column}}::timestamp) AS _start',
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' FROM ({{=it.query}}) _cdb_source',
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'),',
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'interval_in_days AS (',
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' SELECT' ,
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' DATE_PART(\'day\', _end - _start) AS days',
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' FROM dates',
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'),',
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'interval_in_hours AS (',
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' SELECT',
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' days * 24 + DATE_PART(\'hour\', _end - _start) AS hours',
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' FROM interval_in_days, dates',
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'),',
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'interval_in_minutes AS (',
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' SELECT',
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' hours * 60 + DATE_PART(\'minute\', _end - _start) AS minutes',
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' FROM interval_in_hours, dates',
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'),',
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'interval_in_seconds AS (',
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' SELECT',
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' minutes * 60 + DATE_PART(\'second\', _end - _start) AS seconds',
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' FROM interval_in_minutes, dates',
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')',
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'SELECT',
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' ROUND(days / 365) AS year,',
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' ROUND(days / 90) AS quarter,',
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' ROUND(days / 30) AS month,',
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' ROUND(days / 7) AS week,',
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' days AS day,',
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' hours AS hour,',
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' minutes AS minute,',
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' seconds AS second',
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'FROM interval_in_days, interval_in_hours, interval_in_minutes, interval_in_seconds'
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].join('\n'));
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var MAX_INTERVAL_VALUE = 366;
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var BIN_MIN_NUMBER = 6;
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var BIN_MAX_NUMBER = 48;
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var filteredQueryTpl = dot.template([
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'filtered_source AS (',
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' SELECT *',
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' FROM ({{=it._query}}) _cdb_filtered_source',
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' WHERE',
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' {{=it._column}} IS NOT NULL',
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' {{?it._isFloatColumn}}AND',
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' {{=it._column}} != \'infinity\'::float',
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' AND',
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' {{=it._column}} != \'-infinity\'::float',
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' AND',
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' {{=it._column}} != \'NaN\'::float{{?}}',
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')'
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].join(' \n'));
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var basicsQueryTpl = dot.template([
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'__cdb_basics AS (',
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' SELECT',
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' max({{=it._column}}) AS max_val, min({{=it._column}}) AS min_val,',
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' avg({{=it._column}}) AS avg_val, count(1) AS total_rows',
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' FROM filtered_source',
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')'
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].join(' \n'));
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var overrideBasicsQueryTpl = dot.template([
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'__cdb_basics AS (',
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' SELECT',
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' max({{=it._end}}) AS max_val, min({{=it._start}}) AS min_val,',
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' avg({{=it._column}}) AS avg_val, count(1) AS total_rows',
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' FROM filtered_source',
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')'
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].join('\n'));
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var iqrQueryTpl = dot.template([
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'iqrange AS (',
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' SELECT max(quartile_max) - min(quartile_max) AS iqr',
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' FROM (',
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' SELECT quartile, max(_cdb_iqr_column) AS quartile_max from (',
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' SELECT {{=it._column}} AS _cdb_iqr_column, ntile(4) over (order by {{=it._column}}',
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' ) AS quartile',
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' FROM filtered_source) _cdb_quartiles',
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' WHERE quartile = 1 or quartile = 3',
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' GROUP BY quartile',
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' ) _cdb_iqr',
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')'
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].join('\n'));
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var binsQueryTpl = dot.template([
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'bins AS (',
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' SELECT CASE WHEN total_rows = 0 OR iqr = 0',
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' THEN 1',
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' ELSE GREATEST(',
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' LEAST({{=it._minBins}}, CAST(total_rows AS INT)),',
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' LEAST(',
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' CAST(((max_val - min_val) / (2 * iqr * power(total_rows, 1/3))) AS INT),',
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' {{=it._maxBins}}',
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' )',
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' )',
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' END AS __cdb_bins_number',
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' FROM __cdb_basics, iqrange, filtered_source',
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' LIMIT 1',
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')'
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].join('\n'));
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var overrideBinsQueryTpl = dot.template([
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'bins AS (',
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' SELECT {{=it._bins}} AS __cdb_bins_number',
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')'
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].join('\n'));
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var nullsQueryTpl = dot.template([
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'nulls AS (',
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' SELECT',
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' count(*) AS __cdb_nulls_count',
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' FROM ({{=it._query}}) _cdb_histogram_nulls',
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' WHERE {{=it._column}} IS NULL',
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')'
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].join('\n'));
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var infinitiesQueryTpl = dot.template([
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'infinities AS (',
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' SELECT',
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' count(*) AS infinities_count',
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' FROM ({{=it._query}}) _cdb_histogram_infinities',
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' WHERE',
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' {{=it._column}} = \'infinity\'::float',
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' OR',
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' {{=it._column}} = \'-infinity\'::float',
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')'
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].join('\n'));
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var nansQueryTpl = dot.template([
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'nans AS (',
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' SELECT',
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' count(*) AS nans_count',
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' FROM ({{=it._query}}) _cdb_histogram_infinities',
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' WHERE {{=it._column}} = \'NaN\'::float',
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')'
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].join('\n'));
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var histogramQueryTpl = dot.template([
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'SELECT',
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' (max_val - min_val) / cast(__cdb_bins_number as float) AS bin_width,',
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' __cdb_bins_number AS bins_number,',
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' __cdb_nulls_count AS nulls_count,',
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' {{?it._isFloatColumn}}infinities_count,',
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' nans_count,{{?}}',
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' avg_val,',
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' CASE WHEN min_val = max_val',
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' THEN 0',
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' ELSE GREATEST(',
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' 1,',
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' LEAST(',
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' WIDTH_BUCKET({{=it._column}}, min_val, max_val, __cdb_bins_number),',
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' __cdb_bins_number',
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' )',
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' ) - 1',
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' END AS bin,',
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' min({{=it._column}})::numeric AS min,',
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' max({{=it._column}})::numeric AS max,',
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' avg({{=it._column}})::numeric AS avg,',
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' count(*) AS freq',
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'FROM filtered_source, __cdb_basics, nulls, bins{{?it._isFloatColumn}}, infinities, nans{{?}}',
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'GROUP BY bin, __cdb_bins_number, bin_width, __cdb_nulls_count,',
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' avg_val{{?it._isFloatColumn}}, infinities_count, nans_count{{?}}',
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'ORDER BY bin'
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].join('\n'));
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var dateBasicsQueryTpl = dot.template([
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'__cdb_basics AS (',
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' SELECT',
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' max(date_part(\'epoch\', {{=it._column}})) AS __cdb_max_val,',
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' min(date_part(\'epoch\', {{=it._column}})) AS __cdb_min_val,',
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' avg(date_part(\'epoch\', {{=it._column}})) AS __cdb_avg_val,',
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' min(date_trunc(',
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' \'{{=it._aggregation}}\', {{=it._column}}::timestamp AT TIME ZONE \'{{=it._offset}}\'',
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' )) AS __cdb_start_date,',
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' max({{=it._column}}::timestamp AT TIME ZONE \'{{=it._offset}}\') AS __cdb_end_date,',
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' count(1) AS __cdb_total_rows',
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' FROM ({{=it._query}}) __cdb_basics_query',
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')'
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].join(' \n'));
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var dateOverrideBasicsQueryTpl = dot.template([
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'__cdb_basics AS (',
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' SELECT',
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' max({{=it._end}}) AS __cdb_max_val,',
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' min({{=it._start}}) AS __cdb_min_val,',
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' avg(date_part(\'epoch\', {{=it._column}})) AS __cdb_avg_val,',
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' min(',
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' date_trunc(',
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' \'{{=it._aggregation}}\',',
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' TO_TIMESTAMP({{=it._start}})::timestamp AT TIME ZONE \'{{=it._offset}}\'',
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' )',
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' ) AS __cdb_start_date,',
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' max(',
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' TO_TIMESTAMP({{=it._end}})::timestamp AT TIME ZONE \'{{=it._offset}}\'',
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' ) AS __cdb_end_date,',
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' count(1) AS __cdb_total_rows',
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' FROM ({{=it._query}}) __cdb_basics_query',
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')'
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].join(' \n'));
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var dateBinsQueryTpl = dot.template([
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'bins AS (',
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' SELECT',
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' __cdb_bins_array,',
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' ARRAY_LENGTH(__cdb_bins_array, 1) AS __cdb_bins_number',
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' FROM (',
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' SELECT',
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' ARRAY(',
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' SELECT GENERATE_SERIES(',
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' __cdb_start_date::timestamptz,',
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' __cdb_end_date::timestamptz,',
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' {{?it._aggregation==="quarter"}}\'3 month\'{{??}}\'1 {{=it._aggregation}}\'{{?}}::interval',
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' )',
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' ) AS __cdb_bins_array',
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' FROM __cdb_basics',
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' ) _cdb_bins_array_query',
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')'
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].join('\n'));
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var dateHistogramQueryTpl = dot.template([
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'SELECT',
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' (__cdb_max_val - __cdb_min_val) / cast(__cdb_bins_number as float) AS bin_width,',
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' __cdb_bins_number AS bins_number,',
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' __cdb_nulls_count AS nulls_count,',
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' CASE WHEN __cdb_min_val = __cdb_max_val',
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' THEN 0',
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' ELSE GREATEST(1, LEAST(',
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' WIDTH_BUCKET(',
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' {{=it._column}}::timestamp AT TIME ZONE \'{{=it._offset}}\',',
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' __cdb_bins_array',
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' ),',
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' __cdb_bins_number',
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' )) - 1',
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' END AS bin,',
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' min(',
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' date_part(',
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' \'epoch\', ',
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' date_trunc(',
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' \'{{=it._aggregation}}\', {{=it._column}}::timestamp AT TIME ZONE \'{{=it._offset}}\'',
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' ) AT TIME ZONE \'{{=it._offset}}\'',
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' )',
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' )::numeric AS timestamp,',
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' date_part(\'epoch\', __cdb_start_date)::numeric AS timestamp_start,',
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' min(date_part(\'epoch\', {{=it._column}}))::numeric AS min,',
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' max(date_part(\'epoch\', {{=it._column}}))::numeric AS max,',
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' avg(date_part(\'epoch\', {{=it._column}}))::numeric AS avg,',
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' count(*) AS freq',
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'FROM ({{=it._query}}) __cdb_histogram, __cdb_basics, bins, nulls',
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'WHERE date_part(\'epoch\', {{=it._column}}) IS NOT NULL',
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'GROUP BY bin, bins_number, bin_width, nulls_count, timestamp_start',
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'ORDER BY bin'
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].join('\n'));
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var TYPE = 'histogram';
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/**
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Numeric histogram:
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{
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type: 'histogram',
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options: {
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column: 'name', // column data type: numeric
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bins: 10 // OPTIONAL
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}
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}
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Time series:
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{
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type: 'histogram',
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options: {
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column: 'date', // column data type: date
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aggregation: 'day' // OPTIONAL (if undefined then it'll be built as numeric)
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offset: -7200 // OPTIONAL (UTC offset in seconds)
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}
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}
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*/
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function Histogram(query, options, queries) {
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if (!_.isString(options.column)) {
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throw new Error('Histogram expects `column` in widget options');
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}
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this.query = query;
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this.queries = queries;
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this.column = options.column;
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this.bins = options.bins;
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this.aggregation = options.aggregation;
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this.offset = options.offset;
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this._columnType = null;
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}
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Histogram.prototype = new BaseWidget();
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Histogram.prototype.constructor = Histogram;
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module.exports = Histogram;
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Histogram.prototype.sql = function(psql, override, callback) {
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var self = this;
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if (!callback) {
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callback = override;
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override = {};
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}
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if (this._columnType === null) {
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this.getColumnType(psql, this.column, this.queries.no_filters, function (err, type) {
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// assume numeric, will fail later
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self._columnType = 'numeric';
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if (!err && !!type) {
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self._columnType = Object.keys(type).find(function (key) {
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return type[key];
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});
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}
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self.sql(psql, override, callback);
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}, true); // use read-only transaction
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return null;
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}
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this._buildQuery(psql, override, callback);
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};
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Histogram.prototype.isDateHistogram = function (override) {
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return this._columnType === 'date' && (this.aggregation !== undefined || override.aggregation !== undefined);
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};
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Histogram.prototype._buildQuery = function (psql, override, callback) {
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var filteredQuery, basicsQuery, binsQuery;
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var _column = this.column;
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var _query = this.query;
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if (this.isDateHistogram(override)) {
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return this._buildDateHistogramQuery(psql, override, callback);
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}
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if (this._columnType === 'date') {
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_column = columnCastTpl({column: _column});
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}
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filteredQuery = filteredQueryTpl({
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_isFloatColumn: this._columnType === 'float',
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_query: _query,
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_column: _column
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});
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if (this._shouldOverride(override)) {
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debug('overriding with %j', override);
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basicsQuery = overrideBasicsQueryTpl({
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_query: _query,
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_column: _column,
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_start: getBinStart(override),
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_end: getBinEnd(override)
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});
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binsQuery = [
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overrideBinsQueryTpl({
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_bins: override.bins
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})
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].join(',\n');
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} else {
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basicsQuery = basicsQueryTpl({
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_query: _query,
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_column: _column
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});
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if (this._shouldOverrideBins(override)) {
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binsQuery = [
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overrideBinsQueryTpl({
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_bins: override.bins
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})
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].join(',\n');
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} else {
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binsQuery = [
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iqrQueryTpl({
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_query: _query,
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_column: _column
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}),
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binsQueryTpl({
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_query: _query,
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_minBins: BIN_MIN_NUMBER,
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_maxBins: BIN_MAX_NUMBER
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})
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].join(',\n');
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}
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}
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var cteSql = [
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filteredQuery,
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basicsQuery,
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binsQuery,
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nullsQueryTpl({
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_query: _query,
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_column: _column
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})
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];
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if (this._columnType === 'float') {
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cteSql.push(
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infinitiesQueryTpl({
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_query: _query,
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_column: _column
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}),
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nansQueryTpl({
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_query: _query,
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_column: _column
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})
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);
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}
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var histogramSql = [
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"WITH",
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cteSql.join(',\n'),
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histogramQueryTpl({
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_isFloatColumn: this._columnType === 'float',
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_query: _query,
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_column: _column
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})
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].join('\n');
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debug(histogramSql);
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return callback(null, histogramSql);
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};
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Histogram.prototype._shouldOverride = function (override) {
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return override && _.has(override, 'start') && _.has(override, 'end') && _.has(override, 'bins');
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};
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Histogram.prototype._shouldOverrideBins = function (override) {
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return override && _.has(override, 'bins');
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};
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var DATE_AGGREGATIONS = {
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'auto': true,
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'minute': true,
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'hour': true,
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'day': true,
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'week': true,
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'month': true,
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'quarter': true,
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'year': true
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};
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Histogram.prototype._buildDateHistogramQuery = function (psql, override, callback) {
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var _column = this.column;
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var _query = this.query;
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var _aggregation = override && override.aggregation ? override.aggregation : this.aggregation;
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var _offset = override && Number.isFinite(override.offset) ? override.offset : this.offset;
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if (!DATE_AGGREGATIONS.hasOwnProperty(_aggregation)) {
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return callback(new Error('Invalid aggregation value. Valid ones: ' +
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Object.keys(DATE_AGGREGATIONS).join(', ')
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));
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}
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if (_aggregation === 'auto') {
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this.getAutomaticAggregation(psql, function (err, aggregation) {
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if (err || aggregation === 'none') {
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this.aggregation = 'day';
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} else {
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this.aggregation = aggregation;
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}
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override.aggregation = this.aggregation;
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this._buildDateHistogramQuery(psql, override, callback);
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}.bind(this));
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return null;
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}
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var dateBasicsQuery;
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if (override && _.has(override, 'start') && _.has(override, 'end')) {
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dateBasicsQuery = dateOverrideBasicsQueryTpl({
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_query: _query,
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_column: _column,
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_aggregation: _aggregation,
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_start: getBinStart(override),
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_end: getBinEnd(override),
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_offset: parseOffset(_offset, _aggregation)
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});
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} else {
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dateBasicsQuery = dateBasicsQueryTpl({
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_query: _query,
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_column: _column,
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_aggregation: _aggregation,
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_offset: parseOffset(_offset, _aggregation)
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});
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}
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var dateBinsQuery = [
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dateBinsQueryTpl({
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_aggregation: _aggregation
|
|
})
|
|
].join(',\n');
|
|
|
|
var nullsQuery = nullsQueryTpl({
|
|
_query: _query,
|
|
_column: _column
|
|
});
|
|
|
|
var dateHistogramQuery = dateHistogramQueryTpl({
|
|
_query: _query,
|
|
_column: _column,
|
|
_aggregation: _aggregation,
|
|
_offset: parseOffset(_offset, _aggregation)
|
|
});
|
|
|
|
var histogramSql = [
|
|
"WITH",
|
|
[
|
|
dateBasicsQuery,
|
|
dateBinsQuery,
|
|
nullsQuery
|
|
].join(',\n'),
|
|
dateHistogramQuery
|
|
].join('\n');
|
|
|
|
debug(histogramSql);
|
|
|
|
return callback(null, histogramSql);
|
|
};
|
|
|
|
Histogram.prototype.getAutomaticAggregation = function (psql, callback) {
|
|
var dateIntervalQuery = dateIntervalQueryTpl({
|
|
query: this.query,
|
|
column: this.column
|
|
});
|
|
|
|
debug(dateIntervalQuery);
|
|
|
|
psql.query(dateIntervalQuery, function (err, result) {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
|
|
var aggegations = result.rows[0];
|
|
var aggregation = Object.keys(aggegations)
|
|
.map(function (key) {
|
|
return {
|
|
name: key,
|
|
value: aggegations[key]
|
|
};
|
|
})
|
|
.reduce(function (closer, current) {
|
|
if (current.value > MAX_INTERVAL_VALUE) {
|
|
return closer;
|
|
}
|
|
|
|
var closerDiff = MAX_INTERVAL_VALUE - closer.value;
|
|
var currentDiff = MAX_INTERVAL_VALUE - current.value;
|
|
|
|
if (Number.isFinite(current.value) && closerDiff > currentDiff) {
|
|
return current;
|
|
}
|
|
|
|
return closer;
|
|
}, { name: 'none', value: -1 });
|
|
|
|
callback(null, aggregation.name);
|
|
});
|
|
};
|
|
|
|
Histogram.prototype.format = function(result, override) {
|
|
override = override || {};
|
|
var buckets = [];
|
|
|
|
var binsCount = getBinsCount(override);
|
|
var width = getWidth(override);
|
|
var binsStart = getBinStart(override);
|
|
var nulls = 0;
|
|
var infinities = 0;
|
|
var nans = 0;
|
|
var avg;
|
|
var timestampStart;
|
|
var aggregation;
|
|
var offset;
|
|
|
|
if (result.rows.length) {
|
|
var firstRow = result.rows[0];
|
|
binsCount = firstRow.bins_number;
|
|
width = firstRow.bin_width || width;
|
|
avg = firstRow.avg_val;
|
|
nulls = firstRow.nulls_count;
|
|
timestampStart = firstRow.timestamp_start;
|
|
infinities = firstRow.infinities_count;
|
|
nans = firstRow.nans_count;
|
|
binsStart = populateBinStart(override, firstRow);
|
|
|
|
if (Number.isFinite(timestampStart)) {
|
|
aggregation = getAggregation(override, this.aggregation);
|
|
offset = getOffset(override, this.offset);
|
|
}
|
|
|
|
buckets = result.rows.map(function(row) {
|
|
return _.omit(
|
|
row,
|
|
'bins_number',
|
|
'bin_width',
|
|
'nulls_count',
|
|
'infinities_count',
|
|
'nans_count',
|
|
'avg_val',
|
|
'timestamp_start'
|
|
);
|
|
});
|
|
}
|
|
|
|
return {
|
|
aggregation: aggregation,
|
|
offset: offset,
|
|
timestamp_start: timestampStart,
|
|
bin_width: width,
|
|
bins_count: binsCount,
|
|
bins_start: binsStart,
|
|
nulls: nulls,
|
|
infinities: infinities,
|
|
nans: nans,
|
|
avg: avg,
|
|
bins: buckets
|
|
};
|
|
};
|
|
|
|
function getAggregation(override, aggregation) {
|
|
return override && override.aggregation ? override.aggregation : aggregation;
|
|
}
|
|
|
|
function getOffset(override, offset) {
|
|
if (override && override.offset) {
|
|
return override.offset;
|
|
}
|
|
if (offset) {
|
|
return offset;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
function getBinStart(override) {
|
|
if (override.hasOwnProperty('start') && override.hasOwnProperty('end')) {
|
|
return Math.min(override.start, override.end);
|
|
}
|
|
return override.start || 0;
|
|
}
|
|
|
|
function getBinEnd(override) {
|
|
if (override.hasOwnProperty('start') && override.hasOwnProperty('end')) {
|
|
return Math.max(override.start, override.end);
|
|
}
|
|
return override.end || 0;
|
|
}
|
|
|
|
function getBinsCount(override) {
|
|
return override.bins || 0;
|
|
}
|
|
|
|
function getWidth(override) {
|
|
var width = 0;
|
|
var binsCount = override.bins;
|
|
|
|
if (binsCount && Number.isFinite(override.start) && Number.isFinite(override.end)) {
|
|
width = (override.end - override.start) / binsCount;
|
|
}
|
|
|
|
return width;
|
|
}
|
|
|
|
function parseOffset(offset, aggregation) {
|
|
if (!offset) {
|
|
return '0';
|
|
}
|
|
if (aggregation === 'hour' || aggregation === 'minute') {
|
|
return '0';
|
|
}
|
|
|
|
var offsetInHours = Math.ceil(offset / 3600);
|
|
return '' + offsetInHours;
|
|
}
|
|
|
|
function populateBinStart(override, firstRow) {
|
|
var binStart;
|
|
|
|
if (firstRow.hasOwnProperty('timestamp')) {
|
|
binStart = firstRow.timestamp;
|
|
} else if (override.hasOwnProperty('start')) {
|
|
binStart = getBinStart(override);
|
|
} else {
|
|
binStart = firstRow.min;
|
|
}
|
|
|
|
return binStart;
|
|
}
|
|
|
|
Histogram.prototype.getType = function() {
|
|
return TYPE;
|
|
};
|
|
|
|
Histogram.prototype.toString = function() {
|
|
return JSON.stringify({
|
|
_type: TYPE,
|
|
_column: this.column,
|
|
_query: this.query
|
|
});
|
|
};
|