void getMetaData(QB qb) throws SemanticException {
    getMetaData(qb, false);
  }
This is phase1 of supporting specifying schema in insert statement
insert into foo(z,y) select a,b from bar;
@see #handleInsertStatementSpec(java.util.List, String, RowResolver, QB, ASTNode)
@throws SemanticException
ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java