28 lines
558 B
SQL
28 lines
558 B
SQL
-- CartoDB Math SQL functions
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-- Mode
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-- https://wiki.postgresql.org/wiki/Aggregate_Mode
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CREATE OR REPLACE FUNCTION cartodb._CDB_Math_final_mode(anyarray)
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RETURNS anyelement AS
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$BODY$
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SELECT a
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FROM unnest($1) a
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GROUP BY 1
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ORDER BY COUNT(1) DESC, 1
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LIMIT 1;
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$BODY$
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LANGUAGE 'sql' IMMUTABLE PARALLEL SAFE;
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DROP AGGREGATE IF EXISTS cartodb.CDB_Math_Mode(anyelement);
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CREATE AGGREGATE cartodb.CDB_Math_Mode(anyelement) (
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SFUNC=array_append,
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STYPE=anyarray,
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FINALFUNC=_CDB_Math_final_mode,
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PARALLEL = SAFE,
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INITCOND='{}'
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);
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