Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/7209#discussion_r34213538
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/parquet/ParquetSchemaSuite.scala
---
@@ -478,11 +478,12 @@ class ParquetSchemaSuite extends ParquetSchemaTest {
StructType(Seq(
StructField(
"f1",
- ArrayType(IntegerType, containsNull = true),
+ ArrayType(
+ StructType(Seq(StructField("num", IntegerType))), containsNull =
false),
--- End diff --
Figured out why the test passes. It's because `array` is considered as a
special name by Parquet LIST backwards-compatibility [rule 3] [1] (this is
specific to parquet-avro). Whenever we see a 2nd level group type named
`array`, Parquet format spec see it as the element type. That's why it's
inferred as a struct here.
[1]:
https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#backward-compatibility-rules
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