Github user decibel commented on a diff in the pull request: https://github.com/apache/incubator-madlib/pull/57#discussion_r71334109 --- Diff: methods/array_ops/src/pg_gp/array_ops.sql_in --- @@ -602,11 +602,22 @@ m4_ifdef(`__HAS_FUNCTION_PROPERTIES__', `NO SQL', `'); * in later GPDB and Postgres versions. */ DROP AGGREGATE IF EXISTS MADLIB_SCHEMA.array_agg(anyelement) CASCADE; -CREATE AGGREGATE MADLIB_SCHEMA.array_agg( anyelement) ( - SFUNC = array_append, - STYPE = anyarray - m4_ifdef( `__POSTGRESQL__', `', `, PREFUNC = array_cat') -); +DO $$ +BEGIN + -- + -- array_agg() compatibility function is only needed PostgreSQL 9.4 or earlier + -- because 9.5 or later has pg_catalog.array_agg(anyarray). + -- + IF regexp_replace(version(), '.*PostgreSQL (\d+\.\d+).*', '\1')::float8 < 9.5 THEN --- End diff -- It would be more straightforward to do current_setting('server_version_num')::int>=90500
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