Thread: pgsql: Refactor/reword some error messages to avoid duplicates

Refactor/reword some error messages to avoid duplicates

Also, remove brackets around "EMPTY [ ARRAY ]".  An error message is
not the place to state that a keyword is optional.

Backpatch to 17.

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/2bb969f3998489e5dc4fe9f2a61185b43581975d

Modified Files
--------------
src/backend/executor/execExprInterp.c            |  8 ++-
src/backend/parser/parse_expr.c                  | 90 +++++++++++++++++-------
src/backend/parser/parse_jsontable.c             |  4 +-
src/test/regress/expected/sqljson_jsontable.out  |  4 +-
src/test/regress/expected/sqljson_queryfuncs.out |  2 +-
5 files changed, 74 insertions(+), 34 deletions(-)