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[SPARK-22067][SQL] ArrowWriter should use position when setting UTF8String ByteBuffer #19284

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[SPARK-22067][SQL] ArrowWriter should use position when setting UTF8String ByteBuffer #19284

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3 changes: 2 additions & 1 deletion sql/core/src/main/scala/org/apache/spark/sql/execution/arrow/ArrowWriter.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -234,8 +234,9 @@ private[arrow] class StringWriter(val valueVector: NullableVarCharVector) extend

override def setValue(input: SpecializedGetters, ordinal: Int): Unit = {
val utf8 = input.getUTF8String(ordinal)
val utf8ByteBuffer = utf8.getByteBuffer
// todo: for off-heap UTF8String, how to pass in to arrow without copy?
valueMutator.setSafe(count, utf8.getByteBuffer, 0, utf8.numBytes())
valueMutator.setSafe(count, utf8ByteBuffer, utf8ByteBuffer.position(), utf8.numBytes())
}
}

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