81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
'use strict';
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var BaseOverviewsDataview = require('./base');
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var BaseDataview = require('../formula');
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var debug = require('debug')('windshaft:widget:formula:overview');
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const utils = require('../../../utils/query-utils');
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var dot = require('dot');
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dot.templateSettings.strip = false;
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const VALID_OPERATIONS = {
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count: true,
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sum: true,
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avg: true
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};
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/** Formulae to calculate the end result using _feature_count from the overview table*/
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function dataviewResult(ctx) {
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switch (ctx.operation) {
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case 'count':
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return `sum(_feature_count)`;
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case 'sum':
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return `sum(${utils.handleFloatColumn(ctx)}*_feature_count)`;
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case 'avg':
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return `sum(${utils.handleFloatColumn(ctx)}*_feature_count)/sum(_feature_count) `;
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}
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return `${ctx.operation}(${utils.handleFloatColumn(ctx)})`;
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}
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const formulaQueryTpl = ctx =>
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`SELECT
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${dataviewResult(ctx)} AS result,
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${utils.countNULLs(ctx)} AS nulls_count
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${ctx.isFloatColumn ? `,${utils.countInfinites(ctx)} AS infinities_count,` : ``}
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${ctx.isFloatColumn ? `${utils.countNaNs(ctx)} AS nans_count` : ``}
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FROM (${ctx.query}) __cdb_formula`;
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function Formula(query, options, queryRewriter, queryRewriteData, params, queries) {
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BaseOverviewsDataview.call(this, query, options, BaseDataview, queryRewriter, queryRewriteData, params, queries);
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this.column = options.column || '1';
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this.operation = options.operation;
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this._isFloatColumn = null;
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this.queries = queries;
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}
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Formula.prototype = Object.create(BaseOverviewsDataview.prototype);
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Formula.prototype.constructor = Formula;
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module.exports = Formula;
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Formula.prototype.sql = function (psql, override, callback) {
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var self = this;
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if (!VALID_OPERATIONS[this.operation]) {
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return this.defaultSql(psql, override, callback);
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}
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if (this._isFloatColumn === null) {
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this._isFloatColumn = false;
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this.getColumnType(psql, this.column, this.queries.no_filters, function (err, type) {
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if (!err && !!type) {
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self._isFloatColumn = type.float;
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}
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self.sql(psql, override, callback);
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});
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return null;
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}
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var formulaSql = formulaQueryTpl({
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isFloatColumn: this._isFloatColumn,
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query: this.rewrittenQuery(this.query),
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operation: this.operation,
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column: this.column
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});
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callback = callback || override;
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debug(formulaSql);
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return callback(null, formulaSql, { usesOverviews: true });
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};
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