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MDEV-13916 Enforce check constraint on JSON type

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When creating a field of type JSON, it will be automatically
converted to TEXT with CHECK (json_valid(`a`)), if there wasn't any
previous check for the column.

Additional things:
- Added two bug fixes that was found while testing JSON. These bug
  fixes has also been pushed to 10.3 (with a test case), but as they
  where minimal and needed to get this task done and tested, the fixes
  are repeated here.
  - CREATE TABLE ... SELECT drops constraints for columns that
    are both in the create and select part.
  - If one has both a default expression and check constraint for a
    column, one can get the error "Expression for field `a` is refering
    to uninitialized field `a`.
- Removed some duplicate MYSQL_PLUGIN_IMPORT symbols
This commit is contained in:
Monty
2019-02-13 19:39:41 +02:00
parent 22feb179ae
commit 0f48949439
10 changed files with 163 additions and 18 deletions
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sql/sql_type.cc
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@ -66,6 +66,7 @@ Type_handler_tiny_blob type_handler_tiny_blob;
Type_handler_medium_blob type_handler_medium_blob;
Type_handler_long_blob type_handler_long_blob;
Type_handler_blob type_handler_blob;
Type_handler_json type_handler_json;
static Type_handler_blob_compressed type_handler_blob_compressed;
Type_handler_interval_DDhhmmssff type_handler_interval_DDhhmmssff;