Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/7533#discussion_r35330021
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -356,6 +358,92 @@ case class StringInstr(str: Expression, substr:
Expression)
}
/**
+ * Returns the substring from string str before count occurrences of the
delimiter delim.
+ * If count is positive, everything the left of the final delimiter
(counting from left) is
+ * returned. If count is negative, every to the right of the final
delimiter (counting from the
+ * right) is returned. substring_index performs a case-sensitive match
when searching for delim.
+ */
+case class Substring_index(strExpr: Expression, delimExpr: Expression,
countExpr: Expression)
+ extends Expression with ImplicitCastInputTypes with CodegenFallback {
+
+ override def dataType: DataType = StringType
+ override def inputTypes: Seq[DataType] = Seq(StringType, StringType,
IntegerType)
+ override def nullable: Boolean = strExpr.nullable || delimExpr.nullable
|| countExpr.nullable
--- End diff --
Sorry, my bad, actually I mean the function `foldable`, not the `nullable`.
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