support for array_repeat array function

[jatin510]

Which issue does this PR close?

Part of #1042

Rationale for this change

What changes are included in this PR?

Added support for array_repeat expression in comet

How are these changes tested?

Added test case for array_repeat in CometExpressionSuite.scala

[jatin510]

apache/datafusion#14236

Currently we are manually casting the count_expr to Int64 datatype.
We can remove this once this PR is merged.

[andygrove]

Thanks @jatin510. This looks good overall. Testing could be more comprehensive to cover edge cases such as nulls for either param and covering different data types.

I am working on establishing a better framework for type checks and testing for the array functions in #1339.

Perhaps we can go ahead and merge this PR and then improve the tests once #1339 is merged. Let's see what other reviewers think.

[jatin510]

Thanks @andygrove for the review.
we can merge this PR.
We can add more tests to other array functions in incremental way.

[andygrove]

I added array_repeat to the follow-on issue for improving test coverage and will merge this once CI is passing. Thanks again @jatin510.

[andygrove]

@jatin510 builds are failing:

error[E0308]: mismatched types
   --> core/src/execution/planner.rs:787:48
    |
787 |                     match count_expr.data_type(Arc::<Schema>::clone(&input_schema))? {
    |                                      --------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&Schema`, found `Arc<Schema>`
    |                                      |
    |                                      arguments to this method are incorrect

[jatin510]

@jatin510 builds are failing:

error[E0308]: mismatched types
   --> core/src/execution/planner.rs:787:48
    |
787 |                     match count_expr.data_type(Arc::<Schema>::clone(&input_schema))? {
    |                                      --------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&Schema`, found `Arc<Schema>`
    |                                      |
    |                                      arguments to this method are incorrect

fixed @andygrove