beliefer commented on code in PR #36365:
URL: https://github.com/apache/spark/pull/36365#discussion_r859307545
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/numberFormatExpressions.scala:
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@@ -168,3 +168,141 @@ 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.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_(454, '999');
+ 454
+ > SELECT _FUNC_(454.00, '000D00');
+ 454.00
+ > SELECT _FUNC_(12454, '99G999');
+ 12,454
+ > SELECT _FUNC_(78.12, '$99.99');
+ $78.12
+ > SELECT _FUNC_(-12454.8, '99G999D9S');
+ 12,454.8-
+ """,
+ since = "3.3.0",
+ group = "string_funcs")
+case class ToCharacter(left: Expression, right: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes with NullIntolerant {
+ private lazy val numberFormat =
right.eval().toString.toUpperCase(Locale.ROOT)
+ private lazy val numberFormatter = new ToNumberParser(numberFormat, true)
+
+ override def dataType: DataType = StringType
+ override def inputTypes: Seq[AbstractDataType] = Seq(DecimalType, StringType)
+ override def checkInputDataTypes(): TypeCheckResult = {
+ val inputTypeCheck = super.checkInputDataTypes()
+ if (inputTypeCheck.isSuccess) {
+ if (right.foldable) {
+ numberFormatter.check()
+ } else {
+ TypeCheckResult.TypeCheckFailure(s"Format expression must be foldable,
but got $right")
+ }
+ } else {
+ inputTypeCheck
+ }
+ }
+ override def prettyName: String = "to_char"
+ override def nullSafeEval(decimal: Any, format: Any): Any = {
+ val input = decimal.asInstanceOf[Decimal]
+ numberFormatter.format(input)
+ }
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ val builder =
+ ctx.addReferenceObj("builder", numberFormatter,
classOf[ToNumberParser].getName)
+ val eval = left.genCode(ctx)
+ val result =
+ code"""
+ |${eval.code}
+ |boolean ${ev.isNull} = ${eval.isNull};
+ |${CodeGenerator.javaType(dataType)} ${ev.value} =
${CodeGenerator.defaultValue(dataType)};
+ |if (!${ev.isNull}) {
+ | ${ev.value} = $builder.format(${eval.value});
+ |}
+ """
+ val stripped = result.stripMargin
+ ev.copy(code = stripped)
+ }
+ override protected def withNewChildrenInternal(
+ newLeft: Expression, newRight: Expression): ToCharacter =
+ 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`.
Review Comment:
ditto
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