Fix pg_mcv_list_items() to produce text[]
The function pg_mcv_list_items() returns values stored in MCV items. The
items may contain columns with different data types, so the function was
generating text array-like representation, but in an ad-hoc way without
properly escaping various characters etc.
Fixed by simply building a text[] array, which also makes it easier to
use from queries etc.
Requires changes to pg_proc entry, so bump catversion.
Backpatch to 12, where multi-column MCV lists were introduced.
Author: Tomas Vondra
Reviewed-by: Dean Rasheed
Discussion: https://postgr.es/m/20190618205920.qtlzcu73whfpfqne@development
Branch
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REL_12_STABLE
Details
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https://git.postgresql.org/pg/commitdiff/cc052b423ad7dc92abb3461a096408c3997c36e1
Modified Files
--------------
src/backend/statistics/mcv.c | 128 ++++++++++++--------------------
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.dat | 2 +-
src/test/regress/expected/stats_ext.out | 6 +-
4 files changed, 51 insertions(+), 87 deletions(-)
