F312 Add grammar support for MERGE #101
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Fixes #28.
request: MERGE INTO CUSTOMER USING ( SELECT AGENT_CODE FROM AGENTS WHERE AGENT_CODE = 'A006') AG ON CUSTOMER.AGENT_CODE = AG.AGENT_CODE WHEN MATCHED THEN DELETE
err message: You have an error in your SQL syntax: MERGE INTO agents a USING (SELECT * FROM agents WHERE commission > 0.15) cd ON (a.agent_code = cd.agent_code) WHEN MATCHED THEN UPDATE SET agent_code = cd.agent_code WHEN NOT MATCHED THEN INSERT (agent_code) VALUES (cd.agent_code) no viable alternative at input 'MERGE' at line 1 position 1 near @01:5='MERGE'<340>1:1
new err message:
class org.apache.shardingsphere.sql.parser.sql.common.segment.generic.AliasSegment cannot be cast to class org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.TableSegment (org.apache.shardingsphere.sql.parser.sql.common.segment.generic.AliasSegment and org.apache.shardingsphere.sql.parser.sql.common.segment.generic.table.TableSegment are in unnamed module of loader 'app')