Andy Grove

Implement more efficient conversion from Spark column to Comet/Arrow column

1

### What is the problem the feature request solves? In `CometRowToColumnarExec` (soon to be renamed to `CometSparkToColumnarExec`) we have code for converting from Spark columns to Comet columns, but it...

Implement initial version of to_json

6

### What is the problem the feature request solves? Now that we have support for CreateNamedStruct in https://github.com/apache/datafusion-comet/pull/620, we could start working on to_json functionality. This functionality is very similar...

Evaluate use of selection vectors in scan-filter-join operations

2

### What is the problem the feature request solves? It is very common to have scan -> filter as inputs to a join. The copying of data in the filter...

Update supported Spark and Java versions in installation guide

3

### What is the problem the feature request solves? Installation guide currently says: Requirements: - Apache Spark 3.3, or 3.4 - JDK 8 and up - GLIBC 2.17 (Centos 7)...

### What is the problem the feature request solves? We currently skip most CI checks for PRs that only touch files under the `docs` directory, making it easy to merge...

### What is the problem the feature request solves? Comet will be easier to adopt if we publish JAR files to Maven. ### Describe the potential solution _No response_ ###...

abs returns incorrect value in some cases

4

### Describe the bug ## SQL ``` SELECT c28, abs(c28) AS x FROM test1 ORDER BY c28; ``` ### Spark Plan ``` AdaptiveSparkPlan isFinalPlan=true +- == Final Plan == *(2)...

Divide by zero produces Infinity instead of NULL

1

### Describe the bug ## SQL ``` SELECT c38, c91, c38 / c91 FROM test0 ORDER BY c38, c91; ``` ### Spark Plan ``` AdaptiveSparkPlan isFinalPlan=true +- == Final Plan...

signum(0) returns incorrect result

3

### Describe the bug ## SQL ``` SELECT c14, Signum(c14) AS x FROM test1 ORDER BY c14; ``` ### Spark Plan ``` AdaptiveSparkPlan isFinalPlan=true +- == Final Plan == *(2)...

Comparison between negative zero and false produces incorrect result

2

### Describe the bug ## SQL ``` SELECT c30, c98, c30 = c98 FROM test0 ORDER BY c30, c98; ``` ### Spark Plan ``` AdaptiveSparkPlan isFinalPlan=true +- == Final Plan...