gengliangwang commented on PR #52504:
URL: https://github.com/apache/spark/pull/52504#issuecomment-3386501673
Here is a detailed RCA:
When parsing the default value expression, the expression in the
reproduction will produce UnresolvedAttribute
```
private def getDefaultExpression(
exprCtx: ExpressionContext,
place: String): DefaultValueExpression = {
// Make sure it can be converted to Catalyst expressions.
val expr = expression(exprCtx)
if (expr.containsPattern(PARAMETER)) {
throw QueryParsingErrors.parameterMarkerNotAllowed(place, expr.origin)
}
DefaultValueExpression(expr, getOriginalText(exprCtx))
}
```
```
override def visitCurrentLike(ctx: CurrentLikeContext): Expression =
withOrigin(ctx) {
...
UnresolvedAttribute.quoted(ctx.name.getText)
}
```
However, in ColumnResolutionHelper.innerResolve , Spark will try to resolve
UnresolvedAttribute as Literal Function if it fail to find the column from
the child node:
```
case u @ UnresolvedAttribute(nameParts) =>
val result = withPosition(u) {
resolveColumnByName(nameParts)
.orElse(LiteralFunctionResolution.resolve(nameParts))
```
After commit
https://github.com/apache/spark/commit/fc1cb7867e5524fd1f632e086ecac8ced41b3f65,
the child node of CreateTable has the output and Spark can find the column
from it, thus it is resolved as a column instead of function.
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