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path: root/src/backend/utils/adt/json.c
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* Initial pgindent and pgperltidy run for v13.Tom Lane2020-05-14
| | | | | | | | | | | Includes some manual cleanup of places that pgindent messed up, most of which weren't per project style anyway. Notably, it seems some people didn't absorb the style rules of commit c9d297751, because there were a bunch of new occurrences of function calls with a newline just after the left paren, all with faulty expectations about how the rest of the call would get indented.
* Introduce "anycompatible" family of polymorphic types.Tom Lane2020-03-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds the pseudo-types anycompatible, anycompatiblearray, anycompatiblenonarray, and anycompatiblerange. They work much like anyelement, anyarray, anynonarray, and anyrange respectively, except that the actual input values need not match precisely in type. Instead, if we can find a common supertype (using the same rules as for UNION/CASE type resolution), then the parser automatically promotes the input values to that type. For example, "myfunc(anycompatible, anycompatible)" can match a call with one integer and one bigint argument, with the integer automatically promoted to bigint. With anyelement in the definition, the user would have had to cast the integer explicitly. The new types also provide a second, independent set of type variables for function matching; thus with "myfunc(anyelement, anyelement, anycompatible) returns anycompatible" the first two arguments are constrained to be the same type, but the third can be some other type, and the result has the type of the third argument. The need for more than one set of type variables was foreseen back when we first invented the polymorphic types, but we never did anything about it. Pavel Stehule, revised a bit by me Discussion: https://postgr.es/m/CAFj8pRDna7VqNi8gR+Tt2Ktmz0cq5G93guc3Sbn_NVPLdXAkqA@mail.gmail.com
* Introduce macros for typalign and typstorage constants.Tom Lane2020-03-04
| | | | | | | | | | | | | | | | | | | | | Our usual practice for "poor man's enum" catalog columns is to define macros for the possible values and use those, not literal constants, in C code. But for some reason lost in the mists of time, this was never done for typalign/attalign or typstorage/attstorage. It's never too late to make it better though, so let's do that. The reason I got interested in this right now is the need to duplicate some uses of the TYPSTORAGE constants in an upcoming ALTER TYPE patch. But in general, this sort of change aids greppability and readability, so it's a good idea even without any specific motivation. I may have missed a few places that could be converted, and it's even more likely that pending patches will re-introduce some hard-coded references. But that's not fatal --- there's no expectation that we'd actually change any of these values. We can clean up stragglers over time. Discussion: https://postgr.es/m/16457.1583189537@sss.pgh.pa.us
* Move jsonapi.c and jsonapi.h to src/common.Robert Haas2020-01-29
| | | | | | | | | | | 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
* Move some code from jsonapi.c to jsonfuncs.c.Robert Haas2020-01-27
| | | | | | | | | | | | | | Specifically, move those functions that depend on ereport() from jsonapi.c to jsonfuncs.c, in preparation for allowing jsonapi.c to be used from frontend code. A few cases where elog(ERROR, ...) is used for can't-happen conditions are left alone; we can handle those in some other way in frontend code. Reviewed by Mark Dilger and Andrew Dunstan. Discussion: http://postgr.es/m/CA+TgmoYfOXhd27MUDGioVh6QtpD0C1K-f6ObSA10AWiHBAL5bA@mail.gmail.com
* Adjust pg_parse_json() so that it does not directly ereport().Robert Haas2020-01-27
| | | | | | | | | | | | | | | | | | | | | Instead, it now returns a value indicating either success or the type of error which occurred. The old behavior is still available by calling pg_parse_json_or_ereport(). If the new interface is used, an error can be thrown by passing the return value of pg_parse_json() to json_ereport_error(). pg_parse_json() can still elog() in can't-happen cases, but it seems like that issue is best handled separately. Adjust json_lex() and json_count_array_elements() to return an error code, too. This is all in preparation for making the backend's json parser available to frontend code. Reviewed and/or tested by Mark Dilger and Andrew Dunstan. Discussion: http://postgr.es/m/CA+TgmoYfOXhd27MUDGioVh6QtpD0C1K-f6ObSA10AWiHBAL5bA@mail.gmail.com
* Split JSON lexer/parser from 'json' data type support.Robert Haas2020-01-24
| | | | | | | | | | | | | | | | | | | | Keep the code that pertains to the 'json' data type in json.c, but move the lexing and parsing code to a new file jsonapi.c, a name I chose because the corresponding prototypes are in jsonapi.h. This seems like a logical division, because the JSON lexer and parser are also used by the 'jsonb' data type, but the SQL-callable functions in json.c are a separate thing. Also, the new jsonapi.c file needs to include far fewer header files than json.c, which seems like a good sign that this is an appropriate place to insert an abstraction boundary. I took the opportunity to remove a few apparently-unneeded includes from json.c at the same time. Patch by me, reviewed by David Steele, Mark Dilger, and Andrew Dunstan. The previous commit was, too, but I forgot to note it in the commit message. Discussion: http://postgr.es/m/CA+TgmoYfOXhd27MUDGioVh6QtpD0C1K-f6ObSA10AWiHBAL5bA@mail.gmail.com
* Update copyrights for 2020Bruce Momjian2020-01-01
| | | | Backpatch-through: update all files in master, backpatch legal files through 9.4
* Make the order of the header file includes consistent in backend modules.Amit Kapila2019-11-12
| | | | | | | | | | | Similar to commits 7e735035f2 and dddf4cdc33, this commit makes the order of header file inclusion consistent for backend modules. In the passing, removed a couple of duplicate inclusions. Author: Vignesh C Reviewed-by: Kuntal Ghosh and Amit Kapila Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com
* Allow datetime values in JsonbValueAlexander Korotkov2019-09-25
| | | | | | | | | | | | | | | | | | | | SQL/JSON standard allows manipulation with datetime values. So, it appears to be convinient to allow datetime values to be represented in JsonbValue struct. These datetime values are allowed for temporary representation only. During serialization datetime values are converted into strings. SQL/JSON requires writing timestamps with timezone in the same timezone offset as they were parsed. This is why we allow storage of timezone offset in JsonbValue struct. For the same reason timezone offset argument is added to JsonEncodeDateTime() function. Extracted from original patch by Nikita Glukhov, Teodor Sigaev, Oleg Bartunov. Revised by me. Comments were adjusted by Liudmila Mantrova. Discussion: https://postgr.es/m/fcc6fc6a-b497-f39a-923d-aa34d0c588e8%402ndQuadrant.com Discussion: https://postgr.es/m/CAPpHfdsZgYEra_PeCLGNoXOWYx6iU-S3wF8aX0ObQUcZU%2B4XTw%40mail.gmail.com Author: Nikita Glukhov, Teodor Sigaev, Oleg Bartunov, Alexander Korotkov, Liudmila Mantrova Reviewed-by: Anastasia Lubennikova, Peter Eisentraut
* Phase 2 pgindent run for v12.Tom Lane2019-05-22
| | | | | | | | | Switch to 2.1 version of pg_bsd_indent. This formats multiline function declarations "correctly", that is with additional lines of parameter declarations indented to match where the first line's left parenthesis is. Discussion: https://postgr.es/m/CAEepm=0P3FeTXRcU5B2W3jv3PgRVZ-kGUXLGfd42FFhUROO3ug@mail.gmail.com
* Initial pgindent run for v12.Tom Lane2019-05-22
| | | | | | | | This is still using the 2.0 version of pg_bsd_indent. I thought it would be good to commit this separately, so as to document the differences between 2.0 and 2.1 behavior. Discussion: https://postgr.es/m/16296.1558103386@sss.pgh.pa.us
* Unify error messagesAlvaro Herrera2019-04-24
| | | | ... for translatability purposes.
* Update copyright for 2019Bruce Momjian2019-01-02
| | | | Backpatch-through: certain files through 9.4
* Apply unconstify() in more placesPeter Eisentraut2018-10-25
| | | | Discussion: https://www.postgresql.org/message-id/08adbe4e-38f8-2c73-55f0-591392371687%402ndquadrant.com
* Remove bogus "extern" annotations on function definitions.Tom Lane2018-02-19
| | | | | | | | | While this is not illegal C, project style is to put "extern" only on declarations not definitions. David Rowley Discussion: https://postgr.es/m/CAKJS1f9RKLWXcMBQhvDYhmsMEo+ALuNgA-NE+AX5Uoke9DJ2Xg@mail.gmail.com
* Add some noreturn attributes to help static analyzersPeter Eisentraut2018-01-29
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* Centralize json and jsonb handling of datetime typesAndrew Dunstan2018-01-16
| | | | | | | | | | | | | The creates a single function JsonEncodeDateTime which will format these data types in an efficient and consistent manner. This will be all the more important when we come to jsonpath so we don't have to implement yet more code doing the same thing in two more places. This also extends the code to handle time and timetz types which were not previously handled specially. This requires exposing the time2tm and timetz2tm functions. Patch from Nikita Glukhov
* Update copyright for 2018Bruce Momjian2018-01-02
| | | | Backpatch-through: certain files through 9.3
* Fix typo on commentMagnus Hagander2017-12-18
| | | | Author: David Rowley
* Process variadic arguments consistently in json functionsAndrew Dunstan2017-10-25
| | | | | | | | | | | | json_build_object and json_build_array and the jsonb equivalents did not correctly process explicit VARIADIC arguments. They are modified to use the new extract_variadic_args() utility function which abstracts away the details of the call method. Michael Paquier, reviewed by Tom Lane and Dmitry Dolgov. Backpatch to 9.5 for the jsonb fixes and 9.4 for the json fixes, as that's where they originated.
* Change tupledesc->attrs[n] to TupleDescAttr(tupledesc, n).Andres Freund2017-08-20
| | | | | | | | | | | This is a mechanical change in preparation for a later commit that will change the layout of TupleDesc. Introducing a macro to abstract the details of where attributes are stored will allow us to change that in separate step and revise it in future. Author: Thomas Munro, editorialized by Andres Freund Reviewed-By: Andres Freund Discussion: https://postgr.es/m/CAEepm=0ZtQ-SpsgCyzzYpsXS6e=kZWqk3g5Ygn3MDV7A8dabUA@mail.gmail.com
* Phase 3 of pgindent updates.Tom Lane2017-06-21
| | | | | | | | | | | | | | | | | | | | | | | | | Don't move parenthesized lines to the left, even if that means they flow past the right margin. By default, BSD indent lines up statement continuation lines that are within parentheses so that they start just to the right of the preceding left parenthesis. However, traditionally, if that resulted in the continuation line extending to the right of the desired right margin, then indent would push it left just far enough to not overrun the margin, if it could do so without making the continuation line start to the left of the current statement indent. That makes for a weird mix of indentations unless one has been completely rigid about never violating the 80-column limit. This behavior has been pretty universally panned by Postgres developers. Hence, disable it with indent's new -lpl switch, so that parenthesized lines are always lined up with the preceding left paren. This patch is much less interesting than the first round of indent changes, but also bulkier, so I thought it best to separate the effects. Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
* Phase 2 of pgindent updates.Tom Lane2017-06-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change pg_bsd_indent to follow upstream rules for placement of comments to the right of code, and remove pgindent hack that caused comments following #endif to not obey the general rule. Commit e3860ffa4dd0dad0dd9eea4be9cc1412373a8c89 wasn't actually using the published version of pg_bsd_indent, but a hacked-up version that tried to minimize the amount of movement of comments to the right of code. The situation of interest is where such a comment has to be moved to the right of its default placement at column 33 because there's code there. BSD indent has always moved right in units of tab stops in such cases --- but in the previous incarnation, indent was working in 8-space tab stops, while now it knows we use 4-space tabs. So the net result is that in about half the cases, such comments are placed one tab stop left of before. This is better all around: it leaves more room on the line for comment text, and it means that in such cases the comment uniformly starts at the next 4-space tab stop after the code, rather than sometimes one and sometimes two tabs after. Also, ensure that comments following #endif are indented the same as comments following other preprocessor commands such as #else. That inconsistency turns out to have been self-inflicted damage from a poorly-thought-through post-indent "fixup" in pgindent. This patch is much less interesting than the first round of indent changes, but also bulkier, so I thought it best to separate the effects. Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
* Re-run pgindent.Tom Lane2017-06-13
| | | | | | | | This is just to have a clean base state for testing of Piotr Stefaniak's latest version of FreeBSD indent. I fixed up a couple of places where pgindent would have changed format not-nicely. perltidy not included. Discussion: https://postgr.es/m/VI1PR03MB119959F4B65F000CA7CD9F6BF2CC0@VI1PR03MB1199.eurprd03.prod.outlook.com
* Assorted translatable string fixesAlvaro Herrera2017-06-04
| | | | | Mark our rusage reportage string translatable; remove quotes from type names; unify formatting of very similar messages.
* Fix typo in comment.Heikki Linnakangas2017-05-18
| | | | Daniel Gustafsson
* Post-PG 10 beta1 pgindent runBruce Momjian2017-05-17
| | | | perltidy run not included.
* Use wrappers of PG_DETOAST_DATUM_PACKED() more.Noah Misch2017-03-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | This makes almost all core code follow the policy introduced in the previous commit. Specific decisions: - Text search support functions with char* and length arguments, such as prsstart and lexize, may receive unaligned strings. I doubt maintainers of non-core text search code will notice. - Use plain VARDATA() on values detoasted or synthesized earlier in the same function. Use VARDATA_ANY() on varlenas sourced outside the function, even if they happen to always have four-byte headers. As an exception, retain the universal practice of using VARDATA() on return values of SendFunctionCall(). - Retain PG_GETARG_BYTEA_P() in pageinspect. (Page images are too large for a one-byte header, so this misses no optimization.) Sites that do not call get_page_from_raw() typically need the four-byte alignment. - For now, do not change btree_gist. Its use of four-byte headers in memory is partly entangled with storage of 4-byte headers inside GBT_VARKEY, on disk. - For now, do not change gtrgm_consistent() or gtrgm_distance(). They incorporate the varlena header into a cache, and there are multiple credible implementation strategies to consider.
* Correctly handle array pseudotypes in to_json and to_jsonbAndrew Dunstan2017-02-22
| | | | | | | Columns with array pseudotypes have not been identified as arrays, so they have been rendered as strings in the json and jsonb conversion routines. This change allows them to be rendered as json arrays, making it possible to deal correctly with the anyarray columns in pg_stats.
* Make messages mentioning type names more uniformAlvaro Herrera2017-01-18
| | | | | | | | | This avoids additional translatable strings for each distinct type, as well as making our quoting style around type names more consistent (namely, that we don't quote type names). This continues what started as f402b9950120. Discussion: https://postgr.es/m/20160401170642.GA57509@alvherre.pgsql
* Update copyright via script for 2017Bruce Momjian2017-01-03
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* Fix typos.Robert Haas2016-03-15
| | | | Oskari Saarenmaa
* Fix IsValidJsonNumber() to notice trailing non-alphanumeric garbage.Tom Lane2016-02-03
| | | | | | | | | | | Commit e09996ff8dee3f70 was one brick shy of a load: it didn't insist that the detected JSON number be the whole of the supplied string. This allowed inputs such as "2016-01-01" to be misdetected as valid JSON numbers. Per bug #13906 from Dmitry Ryabov. In passing, be more wary of zero-length input (I'm not sure this can happen given current callers, but better safe than sorry), and do some minor cosmetic cleanup.
* Update copyright for 2016Bruce Momjian2016-01-02
| | | | Backpatch certain files through 9.1
* Remove unnecessary escaping in C character literalsPeter Eisentraut2015-12-22
| | | | '\"' is more commonly written simply as '"'.
* Fix incorrect translation of minus-infinity datetimes for json/jsonb.Tom Lane2015-10-20
| | | | | | | | | | | | | Commit bda76c1c8cfb1d11751ba6be88f0242850481733 caused both plus and minus infinity to be rendered as "infinity", which is not only wrong but inconsistent with the pre-9.4 behavior of to_json(). Fix that by duplicating the coding in date_out/timestamp_out/timestamptz_out more closely. Per bug #13687 from Stepan Perlov. Back-patch to 9.4, like the previous commit. In passing, also re-pgindent json.c, since it had gotten a bit messed up by recent patches (and I was already annoyed by indentation-related problems in back-patching this fix ...)
* Prevent stack overflow in json-related functions.Noah Misch2015-10-05
| | | | | | | | | | | | | | Sufficiently-deep recursion heretofore elicited a SIGSEGV. If an application constructs PostgreSQL json or jsonb values from arbitrary user input, application users could have exploited this to terminate all active database connections. That applies to 9.3, where the json parser adopted recursive descent, and later versions. Only row_to_json() and array_to_json() were at risk in 9.2, both in a non-security capacity. Back-patch to 9.2, where the json type was introduced. Oskari Saarenmaa, reviewed by Michael Paquier. Security: CVE-2015-5289
* Cache argument type information in json(b) aggregate functions.Andrew Dunstan2015-09-18
| | | | | | | | | | | | | | These functions have been looking up type info for every row they process. Instead of doing that we only look them up the first time through and stash the information in the aggregate state object. Affects json_agg, json_object_agg, jsonb_agg and jsonb_object_agg. There is plenty more work to do in making these more efficient, especially the jsonb functions, but this is a virtually cost free improvement that can be done right away. Backpatch to 9.5 where the jsonb variants were introduced.
* Support JSON negative array subscripts everywhereAndrew Dunstan2015-07-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, there was an inconsistency across json/jsonb operators that operate on datums containing JSON arrays -- only some operators supported negative array count-from-the-end subscripting. Specifically, only a new-to-9.5 jsonb deletion operator had support (the new "jsonb - integer" operator). This inconsistency seemed likely to be counter-intuitive to users. To fix, allow all places where the user can supply an integer subscript to accept a negative subscript value, including path-orientated operators and functions, as well as other extraction operators. This will need to be called out as an incompatibility in the 9.5 release notes, since it's possible that users are relying on certain established extraction operators changed here yielding NULL in the event of a negative subscript. For the json type, this requires adding a way of cheaply getting the total JSON array element count ahead of time when parsing arrays with a negative subscript involved, necessitating an ad-hoc lex and parse. This is followed by a "conversion" from a negative subscript to its equivalent positive-wise value using the count. From there on, it's as if a positive-wise value was originally provided. Note that there is still a minor inconsistency here across jsonb deletion operators. Unlike the aforementioned new "-" deletion operator that accepts an integer on its right hand side, the new "#-" path orientated deletion variant does not throw an error when it appears like an array subscript (input that could be recognized by as an integer literal) is being used on an object, which is wrong-headed. The reason for not being stricter is that it could be the case that an object pair happens to have a key value that looks like an integer; in general, these two possibilities are impossible to differentiate with rhs path text[] argument elements. However, we still don't allow the "#-" path-orientated deletion operator to perform array-style subscripting. Rather, we just return the original left operand value in the event of a negative subscript (which seems analogous to how the established "jsonb/json #> text[]" path-orientated operator may yield NULL in the event of an invalid subscript). In passing, make SetArrayPath() stricter about not accepting cases where there is trailing non-numeric garbage bytes rather than a clean NUL byte. This means, for example, that strings like "10e10" are now not accepted as an array subscript of 10 by some new-to-9.5 path-orientated jsonb operators (e.g. the new #- operator). Finally, remove dead code for jsonb subscript deletion; arguably, this should have been done in commit b81c7b409. Peter Geoghegan and Andrew Dunstan
* pgindent run for 9.5Bruce Momjian2015-05-23
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* Remove spurious semicolons.Heikki Linnakangas2015-03-31
| | | | Petr Jelinek
* Render infinite date/timestamps as 'infinity' for json/jsonbAndrew Dunstan2015-02-26
| | | | | | | | | | | | | | Commit ab14a73a6c raised an error in these cases and later the behaviour was copied to jsonb. This is what the XML code, which we then adopted, does, as the XSD types don't accept infinite values. However, json dates and timestamps are just strings as far as json is concerned, so there is no reason not to render these values as 'infinity'. The json portion of this is backpatched to 9.4 where the behaviour was introduced. The jsonb portion only affects the development branch. Per gripe on pgsql-general.
* Fix jsonb Unicode escape processing, and in consequence disallow \u0000.Tom Lane2015-01-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We've been trying to support \u0000 in JSON values since commit 78ed8e03c67d7333, and have introduced increasingly worse hacks to try to make it work, such as commit 0ad1a816320a2b53. However, it fundamentally can't work in the way envisioned, because the stored representation looks the same as for \\u0000 which is not the same thing at all. It's also entirely bogus to output \u0000 when de-escaped output is called for. The right way to do this would be to store an actual 0x00 byte, and then throw error only if asked to produce de-escaped textual output. However, getting to that point seems likely to take considerable work and may well never be practical in the 9.4.x series. To preserve our options for better behavior while getting rid of the nasty side-effects of 0ad1a816320a2b53, revert that commit in toto and instead throw error if \u0000 is used in a context where it needs to be de-escaped. (These are the same contexts where non-ASCII Unicode escapes throw error if the database encoding isn't UTF8, so this behavior is by no means without precedent.) In passing, make both the \u0000 case and the non-ASCII Unicode case report ERRCODE_UNTRANSLATABLE_CHARACTER / "unsupported Unicode escape sequence" rather than claiming there's something wrong with the input syntax. Back-patch to 9.4, where we have to do something because 0ad1a816320a2b53 broke things for many cases having nothing to do with \u0000. 9.3 also has bogus behavior, but only for that specific escape value, so given the lack of field complaints it seems better to leave 9.3 alone.
* Update copyright for 2015Bruce Momjian2015-01-06
| | | | Backpatch certain files through 9.0
* Add several generator functions for jsonb that exist for json.Andrew Dunstan2014-12-12
| | | | | | | | | | | | | | | | The functions are: to_jsonb() jsonb_object() jsonb_build_object() jsonb_build_array() jsonb_agg() jsonb_object_agg() Also along the way some better logic is implemented in json_categorize_type() to match that in the newly implemented jsonb_categorize_type(). Andrew Dunstan, reviewed by Pavel Stehule and Alvaro Herrera.
* Fix JSON aggregates to work properly when final function is re-executed.Tom Lane2014-12-02
| | | | | | | | | | | | Davide S. reported that json_agg() sometimes produced multiple trailing right brackets. This turns out to be because json_agg_finalfn() attaches the final right bracket, and was doing so by modifying the aggregate state in-place. That's verboten, though unfortunately it seems there's no way for nodeAgg.c to check for such mistakes. Fix that back to 9.3 where the broken code was introduced. In 9.4 and HEAD, likewise fix json_object_agg(), which had copied the erroneous logic. Make some cosmetic cleanups as well.
* Fix hstore_to_json_loose's detection of valid JSON number values.Andrew Dunstan2014-12-01
| | | | | | | | | | We expose a function IsValidJsonNumber that internally calls the lexer for json numbers. That allows us to use the same test everywhere, instead of inventing a broken test for hstore conversions. The new function is also used in datum_to_json, replacing the code that is now moved to the new function. Backpatch to 9.3 where hstore_to_json_loose was introduced.
* Revert 95d737ff to add 'ignore_nulls'Stephen Frost2014-09-29
| | | | | | | | | | Per discussion, revert the commit which added 'ignore_nulls' to row_to_json. This capability would be better added as an independent function rather than being bolted on to row_to_json. Additionally, the implementation didn't address complex JSON objects, and so was incomplete anyway. Pointed out by Tom and discussed with Andrew and Robert.
* Remove ill-conceived ban on zero length json object keys.Andrew Dunstan2014-09-25
| | | | | | | | | | We removed a similar ban on this in json_object recently, but the ban in datum_to_json was left, which generate4d sprutious errors in othee json generators, notable json_build_object. Along the way, add an assertion that datum_to_json is not passed a null key. All current callers comply with this rule, but the assertion will catch any possible future misbehaviour.
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