gnehil opened a new pull request, #273:
URL: https://github.com/apache/doris-spark-connector/pull/273
# Proposed changes
Issue Number: close #xxx
## Problem Summary:
When reading data without specifying the columns to read, the following
exception is thrown:
```java
java.lang.ArrayIndexOutOfBoundsException: 0
at
org.apache.doris.spark.read.DorisPartitionReader.$anonfun$get$1(DorisPartitionReader.scala:60)
at
org.apache.doris.spark.read.DorisPartitionReader.$anonfun$get$1$adapted(DorisPartitionReader.scala:56)
at
scala.collection.IndexedSeqOptimized.foreach(IndexedSeqOptimized.scala:36)
at
scala.collection.IndexedSeqOptimized.foreach$(IndexedSeqOptimized.scala:33)
at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:198)
at
org.apache.doris.spark.read.DorisPartitionReader.get(DorisPartitionReader.scala:56)
at
org.apache.doris.spark.read.DorisPartitionReader.get(DorisPartitionReader.scala:31)
at
org.apache.spark.sql.execution.datasources.v2.PartitionIterator.next(DataSourceRDD.scala:107)
at
org.apache.spark.sql.execution.datasources.v2.MetricsRowIterator.next(DataSourceRDD.scala:142)
at
org.apache.spark.sql.execution.datasources.v2.MetricsRowIterator.next(DataSourceRDD.scala:139)
at
org.apache.spark.InterruptibleIterator.next(InterruptibleIterator.scala:40)
at scala.collection.Iterator$$anon$10.next(Iterator.scala:461)
```
Since `ScanBuilder` implements `SupportsPushDownRequiredColumns`, when no
columns are specified for reading, the array of columns that need to be pruned
is empty, and the table schema obtained after error handling is also empty.
Therefore, we add a process to check whether the column to be pruned is
empty and determine whether the pruned column is included in the table,
otherwise an exception will be thrown.
Also added support for the `doris.read.fields` parameter, which processes
the table schema before the optimizer prunes columns.
## Checklist(Required)
1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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