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## Supported functions
All [scalar functions](../function/#scalar-functions) are available in stream processing. All [System Information Functions](../function/#system-information-functions) are <b>not</b> allowed in stream processing. All [Aggregate functions](../function/#aggregate-functions) and [Selection functions](../function/#selection-functions) are available in stream processing, except the followings:
All [scalar functions](../function/#scalar-functions) are available in stream processing. All [System information functions](../function/#system-information-functions) are <b>not</b> allowed in stream processing. All [Aggregate functions](../function/#aggregate-functions) and [Selection functions](../function/#selection-functions) are available in stream processing, except the followings:
- [leastsquares](../function/#leastsquares)
- [percentile](../function/#percentile)
- [top](../function/#leastsquares)