nikolamand-db opened a new pull request, #47668:
URL: https://github.com/apache/spark/pull/47668
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### What changes were proposed in this pull request?
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Create an example parquet table with partitions and insert data in Spark:
```
create table t(col1 string, col2 string, col3 string) using parquet location
'some/path/parquet-test' partitioned by (col1, col2);
insert into t (col1, col2, col3) values ('a', 'b', 'c');
```
Go into the `parquet-test` path in the filesystem and try to copy parquet
data file from path `col1=a/col2=b` directory into `col1=a`. After that, try to
create new table based on parquet data in Spark:
```
create table broken_table using parquet location 'some/path/parquet-test';
```
This query errors with internal error. Stack trace excerpts:
```
org.apache.spark.SparkException: [INTERNAL_ERROR] Eagerly executed command
failed. You hit a bug in Spark or the Spark plugins you use. Please, report
this bug to the corresponding communities or vendors, and provide the full
stack trace. SQLSTATE: XX000
...
Caused by: java.lang.AssertionError: assertion failed: Conflicting partition
column names detected: Partition column name list #0: col1
Partition column name list #1: col1, col2For partitioned table
directories, data files should only live in leaf directories.
And directories at the same level should have the same partition column name.
Please check the following directories for unexpected files or inconsistent
partition column names: file:some/path/parquet-test/col1=a
file:some/path/parquet-test/col1=a/col2=b
at scala.Predef$.assert(Predef.scala:279)
at
org.apache.spark.sql.execution.datasources.PartitioningUtils$.resolvePartitions(PartitioningUtils.scala:391)
...
```
Fix this by changing internal error to user-facing error.
### Why are the changes needed?
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Replace internal error with user-facing one for valid sequence of Spark SQL
operations.
### Does this PR introduce _any_ user-facing change?
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Yes, it presents the user with regular error instead of internal error.
### How was this patch tested?
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Added checks to `ParquetPartitionDiscoverySuite` which simulate the
described scenario by manually breaking parquet table in the filesystem.
### Was this patch authored or co-authored using generative AI tooling?
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No.
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