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move redundant aggregates to CTE

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This commit is contained in:
John Krauss 2016-12-09 22:31:29 +00:00
parent 9f640f0c35
commit 21b108d32c
1 changed files with 22 additions and 16 deletions
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38
src/pg/sql/42_observatory_exploration.sql
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@ -459,23 +459,33 @@ BEGIN
SELECT column_id, table_id
, ST_CountAgg(clipped_tile, 2, True)::Numeric notnull_pixels
, ST_CountAgg(clipped_tile, 2, False)::Numeric pixels
--, ST_CountAgg(clipped_tile, 1, True)::Numeric notnull_pixels
--, ST_CountAgg(clipped_tile, 1, False)::Numeric pixels
FROM clipped_geom
GROUP BY column_id, table_id
), clipped_geom_reagg AS (
SELECT COUNT(*)::BIGINT cnt, a.column_id,
cdb_observatory.FIRST(pixels) first_pixel,
cdb_observatory.FIRST(notnull_pixels) first_notnull_pixel,
cdb_observatory.FIRST(tile) first_tile,
(ST_SummaryStatsAgg(clipped_tile, 2, True)).sum sum_geoms,
(ST_SummaryStatsAgg(clipped_tile, 3, True)).mean mean_fill
FROM clipped_geom_countagg a, clipped_geom b
WHERE a.table_id = b.table_id
AND a.column_id = b.column_id
GROUP BY a.column_id, a.table_id
) SELECT
count(*)::BIGINT, a.column_id
, (CASE WHEN cdb_observatory.FIRST(notnull_pixels) > 0
THEN cdb_observatory.FIRST(notnull_pixels) / cdb_observatory.FIRST(pixels)
cnt, column_id
, (CASE WHEN first_notnull_pixel > 0
THEN first_notnull_pixel / first_pixel
ELSE 1
END)::Numeric AS notnull_percent
, (CASE WHEN cdb_observatory.FIRST(notnull_pixels) > 0
THEN (ST_SummaryStatsAgg(clipped_tile, 2, True)).sum
ELSE COALESCE(ST_Value(cdb_observatory.FIRST(tile), 2, ST_PointOnSurface($1)), 0) * (ST_Area($1) / ST_Area(ST_PixelAsPolygon(cdb_observatory.FIRST(tile), 0, 0)) * cdb_observatory.FIRST(pixels))
, (CASE WHEN first_notnull_pixel > 0
THEN sum_geoms
ELSE COALESCE(ST_Value(first_tile, 2, ST_PointOnSurface($1)), 0)
* (ST_Area($1) / ST_Area(ST_PixelAsPolygon(first_tile, 0, 0)) * first_pixel)
END)::Numeric AS numgeoms
, (CASE WHEN cdb_observatory.FIRST(notnull_pixels) > 0
THEN (ST_SummaryStatsAgg(clipped_tile, 3, True)).mean
ELSE COALESCE(ST_Value(cdb_observatory.FIRST(tile), 3, ST_PointOnSurface($1)), 0)
, (CASE WHEN first_notnull_pixel > 0
THEN mean_fill
ELSE COALESCE(ST_Value(first_tile, 3, ST_PointOnSurface($1)), 0)
END)::Numeric AS percentfill
, null::numeric estnumgeoms, null::numeric meanmediansize
--, ((ST_Area(ST_Transform($1, 3857)) / 1000000) / NullIf(
@ -487,11 +497,7 @@ BEGIN
-- THEN (ST_SummaryStatsAgg(clipped_tile, 1, True)).mean
-- ELSE COALESCE(ST_Value(cdb_observatory.FIRST(tile), 1, ST_PointOnSurface($1)), 0)
-- END)::Numeric AS meanmediansize
FROM clipped_geom_countagg a, clipped_geom b
WHERE a.table_id = b.table_id
AND a.column_id = b.column_id
GROUP BY a.column_id, a.table_id
ORDER BY a.column_id, a.table_id
FROM clipped_geom_reagg
) foo
$string$) USING bounds, filter_geom_ids, desired_num_geoms;
RETURN;