sathiyapk opened a new pull request #34593:
URL: https://github.com/apache/spark/pull/34593
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### What changes were proposed in this pull request?
1. Adds support for Decimal RoundingMode.UP, DOWN and HALF_DOWN by letting
users to pass the rounding mode as argument to round function.
2. bround function calls round function with the argument "half_even"
### Why are the changes needed?
Currently there's no easier and straight forward way to round decimals with
the mode UP, DOWN and HALF_DOWN. People need to use UDF or complex operations
to do the same.
### Does this PR introduce _any_ user-facing change?
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Now, users can specify the rounding mode while calling round function for
round modes up, down, half_down. Calling round function without rounding mode
will default to half_up.
```
> SELECT round(3.145, 2)
3.15
>SELECT round(3.145, 2, 'down')
3.14
```
```
df.withColumn("value_rounded", round('value, 0)
df.withColumn("value_rounded", round('value, 0, "down")
```
### How was this patch tested?
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This patch was tested locally using unit test and git workflow.
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