Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r157125671
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -50,15 +51,23 @@ import org.apache.spark.unsafe.types.{ByteArray,
UTF8String}
""")
case class Concat(children: Seq[Expression]) extends Expression with
ImplicitCastInputTypes {
- override def inputTypes: Seq[AbstractDataType] =
Seq.fill(children.size)(StringType)
- override def dataType: DataType = StringType
+ private lazy val isBinaryMode = children.nonEmpty &&
children.forall(_.dataType == BinaryType)
--- End diff --
`pg` and `hive` have the same;
```
postgres=# create table t1(a bytea, b bytea, c varchar, d varchar);
postgres=# create view v1 as select a || b || c || d from t1;
postgres=# \d v1
View "public.view41_1"
Column | Type | Modifiers
----------+------+-----------
?column? | text |
hive> create table t1(a binary, b binary, c text, d test);
hive> create view v1 as select a || b || c || d from t1;
hive> describe v1;
_c0 string
```
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