pgsql: Improve error reporting for jsonpath .double() method

From: Alexander Korotkov <akorotkov(at)postgresql(dot)org>
To: pgsql-committers(at)lists(dot)postgresql(dot)org
Subject: pgsql: Improve error reporting for jsonpath .double() method
Date: 2020-07-11 00:25:30
Message-ID: E1ju3Kc-00013r-Os@gemulon.postgresql.org
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Improve error reporting for jsonpath .double() method

When jsonpath .double() method detects that numeric or string can't be
converted to double precision, it throws an error. This commit makes these
errors explicitly express the reason of failure.

Discussion: https://postgr.es/m/CAPpHfdtqJtiSXkP7tOXez18NxhLUH_-75bL8%3DOce4Ki%2Bbv7V6Q%40mail.gmail.com
Author: Alexander Korotkov
Reviewed-by: Tom Lane
Backpatch-through: 12

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/0657181167467ec5cfb5a28aacf47ca02f5f4588

Modified Files
--------------
src/backend/utils/adt/jsonpath_exec.c | 4 ++--
src/test/regress/expected/jsonb_jsonpath.out | 8 +++++---
src/test/regress/sql/jsonb_jsonpath.sql | 1 +
3 files changed, 8 insertions(+), 5 deletions(-)

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