Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/16882#discussion_r100667599
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
---
@@ -321,12 +321,12 @@ trait CheckAnalysis extends PredicateHelper {
// Check if the data types match.
dataTypes(child).zip(ref).zipWithIndex.foreach { case ((dt1,
dt2), ci) =>
// SPARK-18058: we shall not care about the nullability of
columns
- if (!dt1.sameType(dt2)) {
+ if (TypeCoercion.findWiderTypeForTwo(dt1.asNullable,
dt2.asNullable).isEmpty) {
failAnalysis(
s"""
|${operator.nodeName} can only be performed on
tables with the compatible
- |column types. $dt1 <> $dt2 at the
${ordinalNumber(ci)} column of
- |the ${ordinalNumber(ti + 1)} table
+ |column types. ${dt1.simpleString} <>
${dt2.simpleString} at the
--- End diff --
(I used `simpleString` for consistency with other codes in this)
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