SQL/JSON: Fix issues with DEFAULT .. ON ERROR / EMPTY
SQL/JSON query functions allow specifying an expression to return
when either of ON ERROR or ON EMPTY condition occurs when evaluating
the JSON path expression. The parser (transformJsonBehavior()) checks
that the specified expression is one of the supported expressions, but
there are two issues with how the check is done that are fixed in this
commit:
* No check for some expressions related to coercion, such as
CoerceViaIO, that may appear in the transformed user-specified
expressions that include cast(s)
* An unsupported expression may be masked by a coercion-related
expression, which must be flagged by checking the latter's
argument expression recursively
Author: Jian He <jian.universality@gmail.com>
Author: Amit Langote <amitlangote09@gmail.com>
Reported-by: Jian He <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CACJufxEqhqsfrg_p7EMyo5zak3d767iFDL8vz_4%3DZBHpOtrghw@mail.gmail.com
Discussion: https://postgr.es/m/CACJufxGOerH1QJknm1noh-Kz5FqU4p7QfeZSeVT2tN_4SLXYNg@mail.gmail.com
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/c0fc0751862d4e9b7ca9d51f2cd79344690ec873
Modified Files
--------------
src/backend/parser/parse_expr.c | 37 ++++++++++++++-
src/test/regress/expected/sqljson_jsontable.out | 32 +++++++++++++
src/test/regress/expected/sqljson_queryfuncs.out | 57 ++++++++++++++++++++++++
src/test/regress/sql/sqljson_jsontable.sql | 16 +++++++
src/test/regress/sql/sqljson_queryfuncs.sql | 27 +++++++++++
5 files changed, 167 insertions(+), 2 deletions(-)