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new 70b4b1d1f69 [SPARK-38979][SQL] Improve error log readability in
OrcUtils.requestedColumnIds
70b4b1d1f69 is described below
commit 70b4b1d1f69be3a15eadb0e798139982c152b7bb
Author: sychen <[email protected]>
AuthorDate: Wed Apr 27 08:38:28 2022 -0500
[SPARK-38979][SQL] Improve error log readability in
OrcUtils.requestedColumnIds
### What changes were proposed in this pull request?
Add detailed log in `OrcUtils#requestedColumnIds`.
### Why are the changes needed?
In `OrcUtils#requestedColumnIds` sometimes it fails because
`orcFieldNames.length > dataSchema.length`, the log is not very clear.
```
java.lang.AssertionError: assertion failed: The given data schema
struct<field1:int> has less fields than the actual ORC physical schema, no idea
which columns were dropped, fail to read.
```
after the change
```
java.lang.AssertionError: assertion failed: The given data schema
struct<field1:int> (length:1) has fewer 1 fields than the actual ORC physical
schema struct<field1:int,field2:int> (length:2), no idea which columns were
dropped, fail to read.
```
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
exist UT / local test
Closes #36296 from cxzl25/SPARK-38979.
Authored-by: sychen <[email protected]>
Signed-off-by: Sean Owen <[email protected]>
---
.../org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git
a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
index f07573beae6..1783aadaa78 100644
---
a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
+++
b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcUtils.scala
@@ -224,7 +224,9 @@ object OrcUtils extends Logging {
// the physical schema doesn't match the data schema).
// In these cases we map the physical schema to the data schema by
index.
assert(orcFieldNames.length <= dataSchema.length, "The given data
schema " +
- s"${dataSchema.catalogString} has less fields than the actual ORC
physical schema, " +
+ s"${dataSchema.catalogString} (length:${dataSchema.length}) " +
+ s"has fewer ${orcFieldNames.length - dataSchema.length} fields than
" +
+ s"the actual ORC physical schema $orcSchema
(length:${orcFieldNames.length}), " +
"no idea which columns were dropped, fail to read.")
// for ORC file written by Hive, no field names
// in the physical schema, there is a need to send the
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