pgsql: Support 'q' flag in jsonpath 'like_regex' predicate

Support 'q' flag in jsonpath 'like_regex' predicate

SQL/JSON standard defines that jsonpath 'like_regex' predicate should support
the same set of flags as XQuery/XPath. It appears that implementation of 'q'
flag was missed. This commit fixes that.

Discussion: https://postgr.es/m/CAPpHfdtyfPsxLYiTjp5Ov8T5xGsB5t3CwE5%2B3PS%3DLLwA%2BxTJog%40mail.gmail.com
Author: Nikita Glukhov, Alexander Korotkov

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/261a5c1928566f938cbda0f62dc16f6a2d1e871d

Modified Files
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src/backend/utils/adt/jsonpath.c | 2 ++
src/backend/utils/adt/jsonpath_exec.c | 11 +++++++++
src/backend/utils/adt/jsonpath_gram.y | 8 +++++++
src/include/utils/jsonpath.h | 1 +
src/test/regress/expected/jsonb_jsonpath.out | 36 ++++++++++++++++++++++++++++
src/test/regress/expected/jsonpath.out | 18 ++++++++++++++
src/test/regress/sql/jsonb_jsonpath.sql | 6 +++++
src/test/regress/sql/jsonpath.sql | 3 +++
8 files changed, 85 insertions(+)