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Partial implementation of SQL/JSON path language

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SQL 2016 standards among other things contains set of SQL/JSON features for
JSON processing inside of relational database.  The core of SQL/JSON is JSON
path language, allowing access parts of JSON documents and make computations
over them.  This commit implements partial support JSON path language as
separate datatype called "jsonpath".  The implementation is partial because
it's lacking datetime support and suppression of numeric errors.  Missing
features will be added later by separate commits.

Support of SQL/JSON features requires implementation of separate nodes, and it
will be considered in subsequent patches.  This commit includes following
set of plain functions, allowing to execute jsonpath over jsonb values:

 * jsonb_path_exists(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_match(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_query(jsonb, jsonpath[, jsonb, bool]),
 * jsonb_path_query_array(jsonb, jsonpath[, jsonb, bool]).
 * jsonb_path_query_first(jsonb, jsonpath[, jsonb, bool]).

This commit also implements "jsonb @? jsonpath" and "jsonb @@ jsonpath", which
are wrappers over jsonpath_exists(jsonb, jsonpath) and jsonpath_predicate(jsonb,
jsonpath) correspondingly.  These operators will have an index support
(implemented in subsequent patches).

Catversion bumped, to add new functions and operators.

Code was written by Nikita Glukhov and Teodor Sigaev, revised by me.
Documentation was written by Oleg Bartunov and Liudmila Mantrova.  The work
was inspired by Oleg Bartunov.

Discussion: https://postgr.es/m/fcc6fc6a-b497-f39a-923d-aa34d0c588e8%402ndQuadrant.com
Author: Nikita Glukhov, Teodor Sigaev, Alexander Korotkov, Oleg Bartunov, Liudmila Mantrova
Reviewed-by: Tomas Vondra, Andrew Dunstan, Pavel Stehule, Alexander Korotkov
This commit is contained in:
Alexander Korotkov
2019-03-16 12:15:37 +03:00
parent 893d6f8a1f
commit 72b6460336
33 changed files with 9079 additions and 55 deletions
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4
src/backend/utils/adt/regexp.c
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@ -133,7 +133,7 @@ static Datum build_regexp_split_result(regexp_matches_ctx *splitctx);
* Pattern is given in the database encoding. We internally convert to
* an array of pg_wchar, which is what Spencer's regex package wants.
*/
static regex_t *
regex_t *
RE_compile_and_cache(text *text_re, int cflags, Oid collation)
{
int text_re_len = VARSIZE_ANY_EXHDR(text_re);
@ -339,7 +339,7 @@ RE_execute(regex_t *re, char *dat, int dat_len,
* Both pattern and data are given in the database encoding. We internally
* convert to array of pg_wchar which is what Spencer's regex package wants.
*/
static bool
bool
RE_compile_and_execute(text *text_re, char *dat, int dat_len,
int cflags, Oid collation,
int nmatch, regmatch_t *pmatch)