[C++][Gandiva] Support functions for average, current timestamp, round with rounding modes
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Component: Gandiva
Type: enhancement
- Dominant language
- C++
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Description
### Describe the enhancement requested
1. Add a no argument function to get current timestamp in Gandiva
2. Support average (double, double ) method in Gandiva
3. Enhance round function in Gandiva to accept rounding modes including - up, down, half_up, half_down, half_even_floor , ceiling
### Component(s)
C++ - Gandiva
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