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add doc (#11531) 

Co-authored-by: yuanyi <yuanyi@freewheel.tv>
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Yi Yuan 2021-08-03 12:20:29 +08:00 committed by GitHub
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docs/querying/sql.md
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@ -376,6 +376,7 @@ to FLOAT. At runtime, Druid will widen 32-bit floats to 64-bit for most expressi
|Function|Notes|
|--------|-----|
|`PI`|Constant Pi.|
|`ABS(expr)`|Absolute value.|
|`CEIL(expr)`|Ceiling.|
|`EXP(expr)`|e to the power of expr.|