andygrove commented on PR #1920:
URL:
https://github.com/apache/datafusion-comet/pull/1920#issuecomment-3004952533
I added the following method to `FileReader` locally:
```scala
/** Sets the projected columns to be read later via {@link
#readNextRowGroup()} */
public void setRequestedSchemaFromSpecs(List<ParquetColumnSpec>
projection) {
paths.clear();
for (ParquetColumnSpec columnSpec : projection) {
ColumnDescriptor col = Utils.buildColumnDescriptor(columnSpec);
paths.put(ColumnPath.get(col.getPath()), col);
}
}
```
I can now compile Iceberg, but I get an exception at runtime, and I do not
yet understand why:
```
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 3.4.3
/_/
Using Scala version 2.12.17 (OpenJDK 64-Bit Server VM, Java 11.0.27)
Type in expressions to have them evaluated.
Type :help for more information.
scala> spark.sql(s"CREATE TABLE IF NOT EXISTS t1 (c0 INT, c1 STRING) USING
iceberg")
25/06/25 08:12:29 INFO core/src/lib.rs: Comet native library version 0.9.0
initialized
25/06/25 08:12:29 WARN CometExecRule: Comet cannot execute some parts of
this plan natively (set spark.comet.explainFallback.enabled=false to disable
this logging):
CreateTable [COMET: CreateTable is not supported]
res0: org.apache.spark.sql.DataFrame = []
scala> spark.sql(s"INSERT INTO t1 VALUES ${(0 until 10000).map(i => (i,
i)).mkString(",")}")
25/06/25 08:12:32 WARN CometExecRule: Comet cannot execute some parts of
this plan natively (set spark.comet.explainFallback.enabled=false to disable
this logging):
AppendData [COMET: AppendData is not supported]
+- LocalTableScan [COMET: LocalTableScan is not supported]
res1: org.apache.spark.sql.DataFrame = []
scala> spark.sql(s"SELECT * from t1").show()
25/06/25 08:12:35 WARN CometExecRule: Comet cannot execute some parts of
this plan natively (set spark.comet.explainFallback.enabled=false to disable
this logging):
CollectLimit [COMET: CollectLimit is not supported]
+- Project
+- BatchScan spark_catalog.default.t1 [COMET: Unsupported scan:
org.apache.iceberg.spark.source.SparkBatchQueryScan. Comet Scan only supports
Parquet and Iceberg Parquet file formats, BatchScan spark_catalog.default.t1 is
not supported]
25/06/25 08:12:35 WARN CheckAllocator: More than one
DefaultAllocationManager on classpath. Choosing first found
25/06/25 08:12:35 ERROR Executor: Exception in task 0.0 in stage 1.0 (TID 32)
java.lang.NoSuchMethodError: 'void
org.apache.comet.parquet.FileReader.setRequestedSchemaFromSpecs(java.util.List)'
at
org.apache.iceberg.parquet.CometVectorizedParquetReader$FileIterator.newCometReader(CometVectorizedParquetReader.java:222)
```
```
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