huaxingao commented on code in PR #1830:
URL: https://github.com/apache/datafusion-comet/pull/1830#discussion_r2127844183
##########
common/src/main/java/org/apache/comet/parquet/TypeUtil.java:
##########
@@ -74,7 +74,7 @@ public static ColumnDescriptor convertToParquet(StructField
field) {
builder = Types.primitive(PrimitiveType.PrimitiveTypeName.INT64,
repetition);
} else if (type == DataTypes.BinaryType) {
builder = Types.primitive(PrimitiveType.PrimitiveTypeName.BINARY,
repetition);
- } else if (type == DataTypes.StringType) {
+ } else if (type == DataTypes.StringType ||
type.sameType(DataTypes.StringType)) {
Review Comment:
This is to support String Collation in Spark 4.0. (e.g. [test("Check order
by on table with collated string
column")](https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/collation/CollationSuite.scala#L1117)
)
Without String Collation, it goes to
https://github.com/apache/spark/blob/master/sql/api/src/main/scala/org/apache/spark/sql/catalyst/parser/DataTypeAstBuilder.scala#L89
which uses singleton `DataTypes.StringType`, so type == DataTypes.StringType,
But with String Collation, it goes to
https://github.com/apache/spark/blob/master/sql/api/src/main/scala/org/apache/spark/sql/catalyst/parser/DataTypeAstBuilder.scala#L94,
so type == DataTypes.StringType fails and I added
type.sameType(DataTypes.StringType to let String Collation pass. Actually, I
think it should be
```
else if (
type == DataTypes.StringType ||
(type.sameType(DataTypes.StringType) && isSpark40Plus())
)
```
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