Github user jianqiao commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/35#discussion_r67582107
--- Diff: parser/SqlParser.ypp ---
@@ -1332,6 +1369,83 @@ opt_limit_clause:
}
}
+opt_window_clause:
+ {
+ $$ = nullptr;
+ }
+ | window_declaration_list
+
+window_declaration_list:
+ window_declaration {
+ $$ = new quickstep::PtrList<quickstep::ParseWindow>();
+ $$->push_back($1);
+ }
+ | window_declaration_list window_declaration {
+ $$ = $1;
+ $$->push_back($2);
+ }
+
+window_declaration:
--- End diff --
I think currently `SqlParser.hpp` is mostly organized in this way:
```
A:
TOKEN_X SubA1 SubA2
...
;
SubA1:
TOKEN_Y SubSubA1 SubSubA2
...
;
SubSubA1:
...
;
...
SubA2:
...
;
```
I.e. kind of infix-order traversal of the grammar tree.
Let's just have this PR in this structure. We can have a standalone PR if
there is a proposal for better organization of the grammar rules.
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