nikolamand-db commented on code in PR #46180:
URL: https://github.com/apache/spark/pull/46180#discussion_r1601309336
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connector/connect/common/src/main/scala/org/apache/spark/sql/connect/common/DataTypeProtoConverter.scala:
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@@ -80,7 +81,7 @@ object DataTypeProtoConverter {
}
private def toCatalystStringType(t: proto.DataType.String): StringType =
- StringType(t.getCollationId)
+ StringType(if (t.getCollation.nonEmpty) t.getCollation else "UTF8_BINARY")
Review Comment:
Please check protobuf
[comment](https://github.com/apache/spark/pull/46180#discussion_r1601306785).
The goal here is to support backwards compatibility in case of old PySpark
client version for example. From protobuf
[docs](https://protobuf.dev/programming-guides/proto3/#default), the default
value for string is empty string so if client fails to set this field (in case
of old client), we interpret collation as `UTF8_BINARY`.
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