Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/229#discussion_r110817047
--- Diff: parser/SqlParser.ypp ---
@@ -1198,23 +1211,49 @@ with_list_element:
$$->set_table_reference_signature($1);
};
+set_operation_union:
+ set_operation_union TOKEN_UNION opt_all_distinct set_operation_intersect
{
+ if ($3) {
+ $$ = new quickstep::ParseSetOperation(@1.first_line,
@1.first_column, quickstep::ParseSetOperation::kUnion);
+ } else {
+ $$ = new quickstep::ParseSetOperation(@1.first_line,
@1.first_column, quickstep::ParseSetOperation::kUnionAll);
+ }
+ $$->addOperand($1);
+ $$->addOperand($4);
+ }
+ | set_operation_intersect {
+ $$ = $1;
+ }
+
+set_operation_intersect:
+ set_operation_intersect TOKEN_INTERSECT select_query {
+ $$ = new quickstep::ParseSetOperation(@1.first_line, @1.first_column,
quickstep::ParseSetOperation::kIntersect);
+ quickstep::ParseSetOperation *op = new quickstep::ParseSetOperation(
+ @3.first_line, @3.first_column,
quickstep::ParseSetOperation::kSelect);
+ op->addOperand($3);
+ $$->addOperand($1);
+ $$->addOperand(op);
+ }
+ | select_query {
+ $$ = new quickstep::ParseSetOperation(@1.first_line, @1.first_column,
quickstep::ParseSetOperation::kSelect);
+ $$->addOperand($1);
+ }
+
select_query:
TOKEN_SELECT opt_all_distinct selection from_clause opt_where_clause
opt_group_by_clause opt_having_clause
--- End diff --
I observed the following warning:
```
SqlParser.ypp:1243.16-31: warning: unused value: $2 [-Wother]
TOKEN_SELECT opt_all_distinct selection from_clause opt_where_clause
opt_group_by_clause opt_having_clause
^^^^^^^^^^^^^^^^
```
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