sunchao commented on a change in pull request #29654:
URL: https://github.com/apache/spark/pull/29654#discussion_r487263461
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/compression/compressionSchemes.scala
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@@ -195,16 +193,16 @@ private[columnar] case object RunLengthEncoding extends
CompressionScheme {
val actualSize = columnType.actualSize(row, ordinal)
_uncompressedSize += actualSize
- if (lastValue.isNullAt(0)) {
- columnType.copyField(row, ordinal, lastValue, 0)
+ if (lastValue == null) {
+ lastValue = columnType.clone(columnType.getField(row, ordinal))
Review comment:
@kiszk Yes it is because `UTF8String`. We reuse `InternalRow` during
each iteration and since `UTF8String` is backed by the same memory region in
the `InternalRow`, it will be updated each time as we load a new row, which is
not correct.
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