cloud-fan commented on a change in pull request #34154:
URL: https://github.com/apache/spark/pull/34154#discussion_r732584160
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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@@ -1328,14 +1328,31 @@ case class StringLocate(substr: Expression, str:
Expression, start: Expression)
}
+/**
+ * Helper class for implementing StringLPad and StringRPad.
+ * Returns the default expression to be used in StringLPad or StringRPad based
on the type of
+ * the input expression.
+ * For character string expressions the default padding expression is the
string literal ' '.
+ * For byte sequence expressions the default padding expression is the byte
literal 0x00.
+ */
+object StringPadDefaultValue {
+ def get(str: Expression): Expression = {
+ str.dataType match {
+ case StringType => Literal(" ")
+ case BinaryType => Literal(Array[Byte](0x00))
Review comment:
is `0x00` a byte literal? is it better than `0.toByte`?
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