HyukjinKwon commented on a change in pull request #31372:
URL: https://github.com/apache/spark/pull/31372#discussion_r565822721
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/package.scala
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@@ -125,20 +125,34 @@ package object util extends Logging {
// Replaces attributes, string literals, complex type extractors with their
pretty form so that
// generated column names don't contain back-ticks or double-quotes.
- def usePrettyExpression(e: Expression): Expression = e transform {
- case a: Attribute => new PrettyAttribute(a)
- case Literal(s: UTF8String, StringType) => PrettyAttribute(s.toString,
StringType)
- case Literal(v, t: NumericType) if v != null =>
PrettyAttribute(v.toString, t)
- case Literal(null, dataType) => PrettyAttribute("NULL", dataType)
- case e: GetStructField =>
- val name = e.name.getOrElse(e.childSchema(e.ordinal).name)
- PrettyAttribute(usePrettyExpression(e.child).sql + "." + name,
e.dataType)
- case e: GetArrayStructFields =>
- PrettyAttribute(usePrettyExpression(e.child) + "." + e.field.name,
e.dataType)
- case r: RuntimeReplaceable =>
- PrettyAttribute(r.mkString(r.exprsReplaced.map(toPrettySQL)), r.dataType)
- case c: CastBase if
!c.getTagValue(Cast.USER_SPECIFIED_CAST).getOrElse(false) =>
- PrettyAttribute(usePrettyExpression(c.child).sql, c.dataType)
+ def usePrettyExpression(
+ e: Expression, existsNonSQLExpression: Boolean = false): Expression = e
match {
+ case e: NonSQLExpression =>
+ e.withNewChildren(e.children.map(child => usePrettyExpression(child,
true)))
Review comment:
Should we handle this in `NonSQLExpression.sql`?
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