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Implement query to get features of a cluster for an aggregated map from @jgoizueta's cluster query

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This commit is contained in:
Daniel García Aubert
2019-02-25 19:40:18 +01:00
parent afd81a7814
commit f82e403180
1 changed files with 28 additions and 0 deletions
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lib/cartodb/models/aggregation/aggregation-query.js
+28
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@@ -448,3 +448,31 @@ const aggregationQueryTemplates = {
module.exports.SUPPORTED_PLACEMENTS = Object.keys(aggregationQueryTemplates);
module.exports.GEOMETRY_COLUMN = 'the_geom_webmercator';
const clusterFeaturesQuery = ctx => `
WITH
_cdb_params AS (
SELECT
${gridResolution(ctx)} AS res
),
_cell AS (
SELECT
ST_MakeEnvelope(
Floor(ST_X(_cdb_query.the_geom_webmercator)/_cdb_params.res)*_cdb_params.res,
Floor(ST_Y(_cdb_query.the_geom_webmercator)/_cdb_params.res)*_cdb_params.res,
Floor(ST_X(_cdb_query.the_geom_webmercator)/_cdb_params.res + 1)*_cdb_params.res,
Floor(ST_Y(_cdb_query.the_geom_webmercator)/_cdb_params.res + 1)*_cdb_params.res,
3857
) AS bbox
FROM (${ctx.sourceQuery}) _cdb_query, _cdb_params
WHERE _cdb_query.cartodb_id = ${ctx.id}
)
SELECT _cdb_query.* FROM _cell, (${ctx.sourceQuery}) _cdb_query
WHERE ST_Intersects(_cdb_query.the_geom_webmercator, _cell.bbox)
`;
module.exports.featuresQuery = (id, options) => clusterFeaturesQuery({
id,
sourceQuery: options.query,
res: 256/options.resolution
});