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839ad5e132
When some expression of an INET6 data type involves conversion to INET6 from
other data types, e.g. in:
- CAST:
SELECT CAST(non_inet6_expr AS INET6)
- CASE and hybrid functions:
SELECT CASE WHEN expr THEN inet6_expr ELSE non_inet6_expr END
- UNION:
SELECT inet6_expr UNION SELECT non_inet6_expr
the result column must be fixed as NULL-able even if the non-inet6 expression itself
is not NULL-able, because at the execution time the conversion can fail.
Details:
- Forcing NULL-ability if conversion from some data type to INET6 is involved
(for non-constant or for expensive expressions).
- Non-expensive constant expressions are tested for NULL-ability at fix_fields() time,
so things like `CAST('::' AS INET6)` are still detected as NOT NULL.
- Adding "bool warn" parameter into a few methods, to avoid redundant warnings
at fix_fields() time when calculating NULL-ability of constant values.
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| .. | ||
| audit_null | ||
| auth_dialog | ||
| auth_ed25519 | ||
| auth_examples | ||
| auth_gssapi | ||
| auth_pam | ||
| auth_pipe | ||
| auth_socket | ||
| aws_key_management | ||
| cracklib_password_check | ||
| daemon_example | ||
| debug_key_management | ||
| disks | ||
| example_key_management | ||
| feedback | ||
| file_key_management | ||
| fulltext | ||
| func_test | ||
| handler_socket | ||
| locale_info | ||
| metadata_lock_info | ||
| qc_info | ||
| query_response_time | ||
| server_audit | ||
| simple_password_check | ||
| sql_errlog | ||
| type_geom | ||
| type_inet | ||
| type_test | ||
| user_variables | ||
| userstat | ||
| versioning | ||
| win_auth_client | ||
| wsrep_info | ||