[GitHub] [flink] JingsongLi edited a comment on issue #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch

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JingsongLi edited a comment on issue #8102: [FLINK-12087][table-runtime-blink] 
Introduce over window operators to blink batch
URL: https://github.com/apache/flink/pull/8102#issuecomment-480694448
 
 
   Consider a new `BaseSlidingOverFrame`:
   It has two abstract method:
   1.`public abstract boolean isLeftBoundRowInWindow(BaseRow inputRow, int 
inputIndex, BaseRow currentRow, int currentIndex);`
   2.`public abstract boolean isRightBoundRowInWindow(BaseRow inputRow, int 
inputIndex, BaseRow currentRow, int currentIndex);`
   In `process`, it will invoke `isLeftBoundRowInWindow` and 
`isRightBoundRowInWindow` to determine boundaries.
   
   In `RowSlidingOverFrame`:
   ```
        @Override
        public boolean isLeftBoundRowInWindow(BaseRow inputRow, int inputIndex, 
BaseRow currentRow,
                        int currentIndex) {
                return inputIndex >= currentIndex + leftOffset;
        }
   
        @Override
        public boolean isRightBoundRowInWindow(BaseRow inputRow, int 
inputIndex, BaseRow currentRow,
                        int currentIndex) {
                return inputIndex <= currentIndex + rightOffset;
        }
   ```
   
   In `RangeSlidingOverFrame`:
   ```
        @Override
        public boolean isLeftBoundRowInWindow(BaseRow inputRow, int inputIndex, 
BaseRow currentRow,
                        int currentIndex) {
                return lbound.compare(inputRow, currentRow) >= 0;
        }
   
        @Override
        public boolean isRightBoundRowInWindow(BaseRow inputRow, int 
inputIndex, BaseRow currentRow,
                        int currentIndex) {
                return rbound.compare(inputRow, currentRow) <= 0;
        }
   ```
   
   I mean the `isLeftBoundRowInWindow` and `isRightBoundRowInWindow` make thing 
more complicated. Still has args: `(BaseRow inputRow, int inputIndex, BaseRow 
currentRow, int currentIndex)`.

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