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While executing maintenance operations (ANALYZE, CLUSTER, REFRESH MATERIALIZED VIEW, REINDEX, or VACUUM), set search_path to 'pg_catalog, pg_temp' to prevent inconsistent behavior. Functions that are used for functional indexes, in index expressions, or in materialized views and depend on a different search path must be declared with CREATE FUNCTION ... SET search_path='...'. This change was previously committed as 05e1737351, then reverted in commit 2fcc7ee7af because it was too late in the cycle. Preparation for the MAINTAIN privilege, which was previously reverted due to search_path manipulation hazards. Discussion: https://postgr.es/m/d4ccaf3658cb3c281ec88c851a09733cd9482f22.camel@j-davis.com Discussion: https://postgr.es/m/E1q7j7Y-000z1H-Hr%40gemulon.postgresql.org Discussion: https://postgr.es/m/e44327179e5c9015c8dda67351c04da552066017.camel%40j-davis.com Reviewed-by: Greg Stark, Nathan Bossart, Noah Misch