Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/454#discussion_r28204090
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/parser/SQLAnalyzer.java ---
@@ -491,14 +506,16 @@ public WindowSpec
buildWindowSpec(SQLParser.Window_specificationContext ctx) {
WindowFrameStartBoundType boundType = null;
if (checkIfExist(context.UNBOUNDED())) {
boundType = WindowFrameStartBoundType.UNBOUNDED_PRECEDING;
- } else if (checkIfExist(context.unsigned_value_specification())) {
+ } else if (checkIfExist(context.PRECEDING())) {
boundType = WindowFrameStartBoundType.PRECEDING;
+ } else if (checkIfExist(context.FOLLOWING())) {
+ boundType = WindowFrameStartBoundType.FOLLOWING;
} else {
boundType = WindowFrameStartBoundType.CURRENT_ROW;
--- End diff --
In pgsql, the default start bound is ```CURRENT_ROW```. Please see the
following quote.
```
The default framing option is RANGE UNBOUNDED PRECEDING, which is the same
as RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW.
```
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