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Backpatch-through: 11
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This requires a bit of further infrastructure-extension to allow
trapping errors reported by numeric_in and pg_unicode_to_server,
but otherwise it's pretty straightforward.
In the case of jsonb_in, we are only capturing errors reported
during the initial "parse" phase. The value-construction phase
(JsonbValueToJsonb) can also throw errors if assorted implementation
limits are exceeded. We should improve that, but it seems like a
separable project.
Andrew Dunstan and Tom Lane
Discussion: https://postgr.es/m/3bac9841-fe07-713d-fa42-606c225567d6@dunslane.net
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Formerly, semantic action functions for the JSON parser returned void,
so that there was no way for them to affect the parser's behavior.
That means in particular that they can't force an error exit except by
longjmp'ing. That won't do in the context of our project to make input
functions return errors softly. Hence, change them to return the same
JsonParseErrorType enum value as the parser itself uses. If an action
function returns anything besides JSON_SUCCESS, the parse is abandoned
and that error code is returned.
Action functions can thus easily return the same error conditions that
the parser already knows about. As an escape hatch for expansion, also
invent a code JSON_SEM_ACTION_FAILED that the core parser does not know
the exact meaning of. When returning this code, an action function
must use some out-of-band mechanism for reporting the error details.
This commit simply makes the API change and causes all the existing
action functions to return JSON_SUCCESS, so that there is no actual
change in behavior here. This is long enough and boring enough that
it seemed best to commit it separately from the changes that make
real use of the new mechanism.
In passing, remove a duplicate assignment of
transform_string_values_scalar.
Discussion: https://postgr.es/m/1436686.1670701118@sss.pgh.pa.us
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Up until now, we've had a policy of only marking certain variables
in the PostgreSQL header files with PGDLLIMPORT, but now we've
decided to mark them all. This means that extensions running on
Windows should no longer operate at a disadvantage as compared to
extensions running on Linux: if the variable is present in a header
file, it should be accessible.
Discussion: http://postgr.es/m/CA+TgmoYanc1_FSfimhgiWSqVyP5KKmh5NP2BWNwDhO8Pg2vGYQ@mail.gmail.com
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Backpatch-through: 10
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Point to the specific line where the error was detected; the
previous code tended to include several preceding lines as well.
Avoid re-scanning the entire input to recompute which line that
was. Simplify the logic a bit. Add test cases.
Simon Riggs and Hamid Akhtar, reviewed by Daniel Gustafsson and myself
Discussion: https://postgr.es/m/CANbhV-EPBnXm3MF_TTWBwwqgn1a1Ghmep9VHfqmNBQ8BT0f+_g@mail.gmail.com
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Backpatch-through: 9.5
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The following header files missed the shot:
- jsonfuncs.h, as of ce0425b.
- jsonapi.h, as of beb4699.
- llvmjit_emit.h as of 7ec0d80.
- partdesc.h, as of 1bb5e78.
Author: Jesse Zhang
Discussion: https://postgr.es/m/CAGf+fX4-8xULEOz09DE2dZGjT+q8VJ--rqfTpvcFwc+A4fc-3Q@mail.gmail.com
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To make this work, (1) makeJsonLexContextCstringLen now takes the
encoding to be used as an argument; (2) check_stack_depth() is made to
do nothing in frontend code, and (3) elog(ERROR, ...) is changed to
pg_log_fatal + exit in frontend code.
Mark Dilger, reviewed and slightly revised by me.
Discussion: http://postgr.es/m/CA+TgmoYfOXhd27MUDGioVh6QtpD0C1K-f6ObSA10AWiHBAL5bA@mail.gmail.com
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