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Add comments for lazy binding in WindowInPandas #2496

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May 25, 2021
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
/*
* Copyright (c) 2020, NVIDIA CORPORATION.
* Copyright (c) 2020-2021, NVIDIA CORPORATION.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
Expand Down Expand Up @@ -54,6 +54,10 @@ case class GpuWindowInPandasExec(
}
}

// On Databricks, binding the references on driver side will get some invalid expressions
// (e.g. none#0L, none@1L) in the `projectList`, causing failures in `test_window` test.
// So need to do the binding for `projectList` lazily, and the binding will actually run
// on executors now.
private lazy val outReferences = {
val allExpressions = windowFramesWithExpressions.map(_._2).flatten
val references = allExpressions.zipWithIndex.map { case (e, i) =>
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,10 @@ case class GpuWindowInPandasExec(
}
}

// On Databricks, binding the references on driver side will get some invalid expressions
// (e.g. none#0L, none@1L) in the `projectList`, causing failures in `test_window` test.
// So need to do the binding for `projectList` lazily, and the binding will actually run
// on executors now.
private lazy val outReferences = {
val allExpressions = windowFramesWithExpressions.map(_._2).flatten
val references = allExpressions.zipWithIndex.map { case (e, i) =>
Expand Down