cartodb-postgresql/scripts-available/CDB_ColumnType.sql

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-- Function returning the type of a column
CREATE OR REPLACE FUNCTION CDB_ColumnType(REGCLASS, TEXT)
RETURNS information_schema.character_data
AS $$
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SELECT
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format_type(a.atttypid, NULL)::information_schema.character_data data_type
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FROM pg_class c
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LEFT JOIN pg_attribute a ON a.attrelid = c.oid
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WHERE c.oid = $1::oid
AND a.attname = $2
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AND a.attstattarget < 0; -- exclude system columns
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$$ LANGUAGE SQL STABLE PARALLEL SAFE;
-- This is to migrate from pre-0.2.0 version
-- See http://github.com/CartoDB/cartodb-postgresql/issues/36
GRANT EXECUTE ON FUNCTION CDB_ColumnType(REGCLASS, TEXT) TO public;