WIDTH_BUCKET function support

[vkingnew]

function width_bucket had supported by oracle and postgresql,hive,sparksql,impala,snowflake and databricks.
please add the same name function and have the same feature.
please refer to:
https://www.postgresql.org/docs/15/functions-math.html
https://docs.snowflake.com/en/sql-reference/functions/width_bucket.html

[wangsimo0]

@TBCCC hi could you please reply here so I can assign this to you~?

[TBCCC]

@TBCCC hi could you please reply here so I can assign this to you~?
OK thx

[wangsimo0]

syntax

WIDTH_BUCKET( <expr> , <min_value> , <max_value> , <num_buckets> )

arguments

1. expr: a numeric value
2. min/max value: numeric value, cannot be equal, while min value can be greater than max value.
3. num_buckets: must greater than 0.

notice

1. when the expression is less than lower bound of the bucket, return 0
2. when the expression is greater than upper bound of the bucket, return bucket_num+1
3. return null if any of those arguments is null

[github-actions]

We have marked this issue as stale because it has been inactive for 6 months. If this issue is still relevant, removing the stale label or adding a comment will keep it active. Otherwise, we'll close it in 10 days to keep the issue queue tidy. Thank you for your contribution to StarRocks!

[vkingnew]

go on developing