43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
function prepareQuery(sql) {
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var affectedTableRegexCache = {
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bbox: /!bbox!/g,
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scale_denominator: /!scale_denominator!/g,
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pixel_width: /!pixel_width!/g,
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pixel_height: /!pixel_height!/g
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};
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return sql
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.replace(affectedTableRegexCache.bbox, 'ST_MakeEnvelope(0,0,0,0)')
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.replace(affectedTableRegexCache.scale_denominator, '0')
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.replace(affectedTableRegexCache.pixel_width, '1')
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.replace(affectedTableRegexCache.pixel_height, '1');
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}
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module.exports.extractTableNames = function extractTableNames(query) {
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return [
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'SELECT * FROM CDB_QueryTablesText($windshaft$',
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prepareQuery(query),
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'$windshaft$) as tablenames'
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].join('');
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};
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function getQueryRowEstimation(query) {
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return 'select CDB_EstimateRowCount(\'' + query + '\') as rows';
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}
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module.exports.getQueryRowCount = getQueryRowEstimation;
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module.exports.getAggregationMetadata = ctx => `
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WITH
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rowEstimation AS (
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${getQueryRowEstimation(ctx.query)}
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),
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geometryType AS (
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SELECT ST_GeometryType(the_geom) as geom_type
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FROM (${ctx.query}) AS __cdb_query WHERE the_geom IS NOT NULL LIMIT 1
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)
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SELECT
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rows AS count,
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geom_type AS type
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FROM rowEstimation, geometryType;
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`;
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