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Apache DataFusion Comet Spark Accelerator

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## Which issue does this PR close? Closes #. ## Rationale for this change Follow up of #426, supports generating random rows for specified struct type. ## What changes are...

## Which issue does this PR close? Related to https://github.com/apache/datafusion-comet/issues/341. ## Rationale for this change I recently added `unhex` so this PR adds `hex`. It's another scalar function that isn't...

## Which issue does this PR close? Part of https://github.com/apache/datafusion-comet/issues/372 ## Rationale for this change To be ready for Spark 4.0 ## What changes are included in this PR? This...

## Which issue does this PR close? Follow up on #331 Closes #282 Related #240 ## Rationale for this change Generate the supported Spark builtin expression list into MD file...

### Describe the bug The github action PR build for Linux Java 11 with Spark 3.4 is not running ### Steps to reproduce Looks like the variable substitution is not...

bug
help wanted

## Which issue does this PR close? Supports `CORR` The implementation mostly is the same as the DataFusion's implementation. The reason we have our own implementation is that DataFusion has...

## Which issue does this PR close? Closes #390. ## Rationale for this change ## What changes are included in this PR? ## How are these changes tested?

### What is the problem the feature request solves? DataFusion HashJoin LeftAnti doesn't support null-aware anti join. See https://github.com/apache/datafusion/issues/10583 ### Describe the potential solution _No response_ ### Additional context _No...

enhancement

## Which issue does this PR close? Closes #. ## Rationale for this change ## What changes are included in this PR? ## How are these changes tested?

### Describe the bug When a String which is an invalid date is cast to a Datetype **In spark 3.2 the error message is** ``` org.apache.spark.SparkException: Job aborted due to...

bug