Need to improve the execution efficiency of the ifnull function.
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement
when sql add condition ```AND ((IFNULL(t.a,0) + IFNULL(t.b,0)) != (IFNULL(t.c,0) + IFNULL(t.d,0))))``` ,The execution time will increase exponentially
Need improve exec efficiency for `ifnull` function
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