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Michael Paquier 4dadd660f0 Fix crashes with CREATE SCHEMA AUTHORIZATION and schema elements ... CREATE SCHEMA AUTHORIZATION with appended schema elements can lead to crashes when comparing the schema name of the query with the schemas used in the qualification of some clauses in the elements' queries. The origin of the problem is that the transformation routine for the elements listed in a CREATE SCHEMA query uses as new, expected, schema name the one listed in CreateSchemaStmt itself. However, depending on the query, CreateSchemaStmt.schemaname may be NULL, being computed instead from the role specification of the query given by the AUTHORIZATION clause, that could be either: - A user name string, with the new schema name being set to the same value as the role given. - Guessed from CURRENT_ROLE, SESSION_ROLE or CURRENT_ROLE, with a new schema name computed from the security context where CREATE SCHEMA is running. Regression tests are added for CREATE SCHEMA with some appended elements (some of them with schema qualifications), covering also some role specification patterns. While on it, this simplifies the context structure used during the transformation of the elements listed in a CREATE SCHEMA query by removing the fields for the role specification and the role type. They were not used, and for the role specification this could be confusing as the schema name may by extracted from that at the beginning of CreateSchemaCommand(). This issue exists for a long time, so backpatch down to all the versions supported. Reported-by: Song Hongyu Author: Michael Paquier Reviewed-by: Richard Guo Discussion: https://postgr.es/m/17909-f65c12dfc5f0451d@postgresql.org Backpatch-through: 11		3 years ago
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analyze.h	Move queryjumble.c code to src/backend/nodes/	3 years ago
kwlist.h	SQL/JSON: support the IS JSON predicate	3 years ago
parse_agg.h	Allow parallel aggregate on string_agg and array_agg	3 years ago
parse_clause.h	Update copyright for 2023	3 years ago
parse_coerce.h	Update copyright for 2023	3 years ago
parse_collate.h	Update copyright for 2023	3 years ago
parse_cte.h	Update copyright for 2023	3 years ago
parse_enr.h	Update copyright for 2023	3 years ago
parse_expr.h	Update copyright for 2023	3 years ago
parse_func.h	Update copyright for 2023	3 years ago
parse_merge.h	Update copyright for 2023	3 years ago
parse_node.h	Make Vars be outer-join-aware.	3 years ago
parse_oper.h	Update copyright for 2023	3 years ago
parse_param.h	Update copyright for 2023	3 years ago
parse_relation.h	Make Vars be outer-join-aware.	3 years ago
parse_target.h	Update copyright for 2023	3 years ago
parse_type.h	Update copyright for 2023	3 years ago
parse_utilcmd.h	Fix crashes with CREATE SCHEMA AUTHORIZATION and schema elements	3 years ago
parser.h	Update copyright for 2023	3 years ago
parsetree.h	Update copyright for 2023	3 years ago
scanner.h	Update copyright for 2023	3 years ago
scansup.h	Update copyright for 2023	3 years ago