dtenedor commented on code in PR #36365:
URL: https://github.com/apache/spark/pull/36365#discussion_r861163608
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/numberFormatExpressions.scala:
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@@ -168,3 +168,142 @@ case class TryToNumber(left: Expression, right:
Expression)
newRight: Expression): TryToNumber =
copy(left = newLeft, right = newRight)
}
+
+/**
+ * A function that converts decimal values to strings, returning NULL if the
decimal value fails to
+ * match the format string.
+ */
+@ExpressionDescription(
+ usage = """
+ _FUNC_(numberExpr, formatExpr) - Convert `numberExpr` to a string based on
the `formatExpr`.
+ Throws an exception if the conversion fails. The format follows the same
semantics as the
+ to_number function.
Review Comment:
Good idea, done. Making some edits helps the reader understand how each part
of the result string is generated (as opposed to consumed).
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