[GitHub] [shardingsphere] sandynz edited a comment on issue #6579: Cannot find PostgreSQL type 'POSTGRESQL_TYPE_UNSPECIFIED' in column type when process binary protocol value

[GitBox <gi...@apache.org>]

sandynz edited a comment on issue #6579:
URL: https://github.com/apache/shardingsphere/issues/6579#issuecomment-678653755


   After fixing `IllegalArgumentException: Cannot find PostgreSQL type 'POSTGRESQL_TYPE_UNSPECIFIED' in column type when process binary protocol value`, there's new exception thrown:
   ```
   Exception in thread "main" org.postgresql.util.PSQLException: ERROR: column "create_time" is of type timestamp without time zone but expression is of type bytea
   ```
   From PostgreSQL driver source, Date/Time/Timestamp/Distinct/Other will use Oid.UNSPECIFIED, all of them set parameter as string, so read unsepcified parameter as string. but still exception:
   ```
   Exception in thread "main" org.postgresql.util.PSQLException: ERROR: column "create_time" is of type timestamp without time zone but expression is of type character varying
   ```
   
   Since `BackendConnection` use `PreparedStatement.setObject(int parameterIndex, Object x)`, Oid is changed as ``x`'s` Java object type, e.g. String. In order to keep Oid.UNSPECIFIED, a new type `TypeUnspecifiedSQLParameter` added.
   


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