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Backpatch-through: 13
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Do this by opening the file in PG_BINARY_R mode. This prevents us from
getting wrong byte count from stat().
Per complaint from Andres Freund
Discussion: https://postgr.es/m/20240707052030.r77hbdkid3mwksop@awork3.anarazel.de
Backpatch to rlease 17 where this code was introduced
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As noticed by Michael Paquier.
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. Add missing copytight notices
. improve code coverage
. put work files in a temp directory in the standard location
. improve error checking in C code
. indent perl files with perltidy
. add some comments
per comments from Michael Paquier
Discussion: https://postgr.es/m/ZiC3-cdFys4-6xSk@paquier.xyz
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Per gripes from Michael Paquier
Discussion: https://postgr.es/m/ZhTQ6_w1vwOhqTQI@paquier.xyz
Along the way, also clean up a handful of typos in 3311ea86ed and
ea7b4e9a2a, found by Alexander Lakhin, and a couple of stylistic
snafus noted by Daniel Westermann and Daniel Gustafsson.
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This parser uses an explicit prediction stack, unlike the present
recursive descent parser where the parser state is represented on the
call stack. This difference makes the new parser suitable for use in
incremental parsing of huge JSON documents that cannot be conveniently
handled piece-wise by the recursive descent parser. One potential use
for this will be in parsing large backup manifests associated with
incremental backups.
Because this parser is somewhat slower than the recursive descent
parser, it is not replacing that parser, but is an additional parser
available to callers.
For testing purposes, if the build is done with -DFORCE_JSON_PSTACK, all
JSON parsing is done with the non-recursive parser, in which case only
trivial regression differences in error messages should be observed.
Author: Andrew Dunstan
Reviewed-By: Jacob Champion
Discussion: https://postgr.es/m/7b0a51d6-0d9d-7366-3a1a-f74397a02f55@dunslane.net
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