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Adds turbo-carto category quantification with exact strategy

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This commit is contained in:
Raul Ochoa 2016-05-17 19:45:37 +02:00
parent cfdac1bcb0
commit a1934c87d5
1 changed files with 37 additions and 6 deletions
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43
lib/cartodb/utils/style/postgres-datasource.js
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@ -23,8 +23,35 @@ var methodTemplates = Object.keys(methods).reduce(function(methodTemplates, meth
return methodTemplates;
}, {});
methodTemplates.category = dot.template([
'WITH',
'categories AS (',
' SELECT {{=it._column}} AS category, count(1) AS value, row_number() OVER (ORDER BY count(1) desc) as rank',
' FROM ({{=it._sql}}) _cdb_aggregation_all',
' GROUP BY {{=it._column}}',
' ORDER BY 2 DESC',
'),',
'agg_categories AS (',
' SELECT \'__other\' category',
' FROM categories',
' WHERE rank >= {{=it._buckets}}',
' GROUP BY 1',
' UNION ALL',
' SELECT CAST(category AS text)',
' FROM categories',
' WHERE rank < {{=it._buckets}}',
')',
'SELECT array_agg(category) AS category FROM agg_categories'
].join('\n'));
var STRATEGY = {
SPLIT: 'split',
EXACT: 'exact'
};
var method2strategy = {
headtails: 'split'
headtails: STRATEGY.SPLIT,
category: STRATEGY.EXACT
};
function PostgresDatasource (pgQueryRunner, username, query) {
@ -38,7 +65,7 @@ PostgresDatasource.prototype.getName = function () {
};
PostgresDatasource.prototype.getRamp = function (column, buckets, method, callback) {
var methodName = methods.hasOwnProperty(method) ? method : 'quantiles';
var methodName = methodTemplates.hasOwnProperty(method) ? method : 'quantiles';
var template = methodTemplates[methodName];
var query = template({ _column: column, _sql: this.query, _buckets: buckets });
@ -48,11 +75,15 @@ PostgresDatasource.prototype.getRamp = function (column, buckets, method, callba
return callback(err);
}
var ramp = result[0][methodName].sort(function(a, b) {
return a - b;
});
var strategy = method2strategy[methodName];
var ramp = result[0][methodName];
if (strategy !== STRATEGY.EXACT) {
ramp = ramp.sort(function(a, b) {
return a - b;
});
}
return callback(null, { ramp: ramp, strategy: method2strategy[methodName] });
return callback(null, { ramp: ramp, strategy: strategy });
});
};