Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7402#discussion_r34619424
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Projection.scala
---
@@ -74,6 +78,43 @@ case class InterpretedMutableProjection(expressions:
Seq[Expression]) extends Mu
}
/**
+ * A projection that could turn any InternalRow into UnsafeRow
+ */
+case class ToUnsafeProjection(fields: Seq[DataType]) extends Projection {
+
+ private[this] val converter = new UnsafeRowConverter(fields.toArray)
+ private[this] val pool = new ObjectPool(10)
+ private[this] var buffer = new Array[Byte](1024)
+ private[this] val unsafeRow = new UnsafeRow()
+
+ override def apply(input: InternalRow): InternalRow = {
+ val numBytes = converter.getSizeRequirement(input)
+ if (numBytes > buffer.length) {
+ buffer = new Array[Byte](numBytes)
+ }
+ pool.clear()
+ converter.writeRow(input, buffer, PlatformDependent.BYTE_ARRAY_OFFSET,
numBytes, pool)
--- End diff --
i think what we want here is to code generate the converters, rather than
using the existing slow converter.
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