Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16954#discussion_r103850171
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -365,17 +385,66 @@ object TypeCoercion {
}
/**
- * Convert the value and in list expressions to the common operator type
- * by looking at all the argument types and finding the closest one that
- * all the arguments can be cast to. When no common operator type is
found
- * the original expression will be returned and an Analysis Exception
will
- * be raised at type checking phase.
+ * Handles type coercion for both IN expression with subquery and IN
+ * expressions without subquery.
+ * 1. In the first case, find the common type by comparing the left hand
side
+ * expression types against corresponding right hand side expression
derived
--- End diff --
`left hand side` -> `left hand side (LHS)`
`right hand side` -> `right hand side (RHS)`
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