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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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15
src/backend/utils/errcodes.txt
View File

@@ -206,6 +206,21 @@ Section: Class 22 - Data Exception
2200N E ERRCODE_INVALID_XML_CONTENT invalid_xml_content
2200S E ERRCODE_INVALID_XML_COMMENT invalid_xml_comment
2200T E ERRCODE_INVALID_XML_PROCESSING_INSTRUCTION invalid_xml_processing_instruction
22030 E ERRCODE_DUPLICATE_JSON_OBJECT_KEY_VALUE duplicate_json_object_key_value
22032 E ERRCODE_INVALID_JSON_TEXT invalid_json_text
22033 E ERRCODE_INVALID_JSON_SUBSCRIPT invalid_json_subscript
22034 E ERRCODE_MORE_THAN_ONE_JSON_ITEM more_than_one_json_item
22035 E ERRCODE_NO_JSON_ITEM no_json_item
22036 E ERRCODE_NON_NUMERIC_JSON_ITEM non_numeric_json_item
22037 E ERRCODE_NON_UNIQUE_KEYS_IN_JSON_OBJECT non_unique_keys_in_json_object
22038 E ERRCODE_SINGLETON_JSON_ITEM_REQUIRED singleton_json_item_required
22039 E ERRCODE_JSON_ARRAY_NOT_FOUND json_array_not_found
2203A E ERRCODE_JSON_MEMBER_NOT_FOUND json_member_not_found
2203B E ERRCODE_JSON_NUMBER_NOT_FOUND json_number_not_found
2203C E ERRCODE_JSON_OBJECT_NOT_FOUND object_not_found
2203F E ERRCODE_JSON_SCALAR_REQUIRED json_scalar_required
2203D E ERRCODE_TOO_MANY_JSON_ARRAY_ELEMENTS too_many_json_array_elements
2203E E ERRCODE_TOO_MANY_JSON_OBJECT_MEMBERS too_many_json_object_members
Section: Class 23 - Integrity Constraint Violation