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Fix category columns aggregation in overviews

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Overviews are created in cascade, each one from the inmediate
lower level, but the stats to decide if a column is a category
should be taken always from the base table.
This commit is contained in:
Javier Goizueta 2016-04-26 18:02:25 +02:00
parent 9a73703954
commit 417cbe7902
1 changed files with 27 additions and 4 deletions
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31
scripts-available/CDB_Overviews.sql
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@ -88,6 +88,26 @@ AS $$
END;
$$ LANGUAGE PLPGSQL IMMUTABLE;
CREATE OR REPLACE FUNCTION _CDB_OverviewBaseTable(overview_table REGCLASS)
RETURNS REGCLASS
AS $$
DECLARE
table_name TEXT;
schema_name TEXT;
base_name TEXT;
base_table REGCLASS;
BEGIN
SELECT * FROM _cdb_split_table_name(overview_table) INTO schema_name, table_name;
base_name := CDB_OverviewBaseTableName(table_name);
IF base_name != table_name THEN
base_table := Format('%I.%I', schema_name, base_name)::regclass;
ELSE
base_table := overview_table;
END IF;
RETURN base_table;
END;
$$ LANGUAGE PLPGSQL IMMUTABLE;
-- Schema and relation names of a table given its reloid
-- Scope: private.
-- Parameters
@ -586,6 +606,7 @@ DECLARE
has_counter_column BOOLEAN;
feature_count TEXT;
total_feature_count TEXT;
base_table REGCLASS;
BEGIN
IF table_alias <> '' THEN
qualified_column := Format('%I.%I', table_alias, column_name);
@ -606,22 +627,24 @@ BEGIN
total_feature_count := 'count(*)';
END IF;
base_table := _CDB_OverviewBaseTable(reloid);
CASE column_type
WHEN 'double precision', 'real', 'integer', 'bigint', 'numeric' THEN
IF column_name = '_feature_count' THEN
RETURN 'SUM(_feature_count)';
ELSE
IF column_type = 'integer' AND _cdb_categorical_column(reloid, column_name) THEN
IF column_type = 'integer' AND _cdb_categorical_column(base_table, column_name) THEN
RETURN Format('CDB_Math_Mode(%s)::', qualified_column) || column_type;
ELSE
RETURN Format('SUM(%s*%s)/%s::' || column_type, qualified_column, feature_count, total_feature_count);
END IF;
END IF;
WHEN 'text', 'character varying', 'character' THEN
IF _cdb_categorical_column(reloid, column_name) THEN
IF _cdb_categorical_column(base_table, column_name) THEN
RETURN Format('_cdb_mode(%s)::', qualified_column) || column_type;
ELSE
IF _cdb_unlimited_text_column(reloid, column_name) THEN
IF _cdb_unlimited_text_column(base_table, column_name) THEN
-- TODO: this should not be applied to columns containing largish text;
-- it is intended only to short names/identifiers
RETURN 'CASE WHEN count(distinct ' || qualified_column || ') = 1 THEN MIN(' || qualified_column || ') WHEN ' || total_feature_count || ' < 5 THEN string_agg(distinct ' || qualified_column || ','' / '') ELSE ''*'' END::' || column_type;
@ -778,7 +801,7 @@ AS $$
IF NOT columns LIKE '%_feature_count%' THEN
columns := columns || ', n AS _feature_count';
END IF;
END IF
EXECUTE Format('DROP TABLE IF EXISTS %I.%I CASCADE;', schema_name, overview_rel);