liujiayi771 opened a new pull request, #46537:
URL: https://github.com/apache/spark/pull/46537
### What changes were proposed in this pull request?
CSV table containing char and varchar columns will result in the following
error when selecting from the CSV table:
```
java.lang.IllegalArgumentException: requirement failed: requiredSchema
(struct<id:int,name:string>) should be the subset of dataSchema
(struct<id:int,name:string>).
at scala.Predef$.require(Predef.scala:281)
at
org.apache.spark.sql.catalyst.csv.UnivocityParser.<init>(UnivocityParser.scala:56)
at
org.apache.spark.sql.execution.datasources.csv.CSVFileFormat.$anonfun$buildReader$2(CSVFileFormat.scala:127)
at
org.apache.spark.sql.execution.datasources.FileFormat$$anon$1.apply(FileFormat.scala:155)
at
org.apache.spark.sql.execution.datasources.FileFormat$$anon$1.apply(FileFormat.scala:140)
at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.org$apache$spark$sql$execution$datasources$FileScanRDD$$anon$$readCurrentFile(FileScanRDD.scala:231)
at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.nextIterator(FileScanRDD.scala:293)
at
org.apache.spark.sql.execution.datasources.FileScanRDD$$anon$1.hasNext(FileScanRDD.scala:125)
```
### Why are the changes needed?
The reason for the above error is that the `StringType` columns in the
`dataSchema` and `requiredSchema` of `UnivocityParser` are not consistent. It
is due to the metadata contained in the `StringType` of the `dataSchema`, which
is missing in the `requiredSchema`. We need to retain the metadata when
resolving schema.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Add a new test case in `CSVSuite`.
### Was this patch authored or co-authored using generative AI tooling?
No.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
