Github user vvysotskyi commented on a diff in the pull request:
https://github.com/apache/drill/pull/805#discussion_r133933369
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetReaderUtility.java
---
@@ -181,6 +186,101 @@ else if (parquetTableMetadata instanceof
Metadata.ParquetTableMetadata_v2 &&
}
/**
+ * Checks that the metadata file has version less than
+ * the version where was changed the serialization of BINARY values
+ * and assigns byte arrays to min/max values obtained from the
deserialized string.
+ *
+ * @param parquetTableMetadata table metadata that should be corrected
+ */
--- End diff --
`ColumnMetadata_v1` class serializes / deserializes `primitiveType` field
so it does not hard to check that field has `BINARY` type.
But `ColumnMetadata_v2` and `ColumnMetadata_v3` does not serialize this
field. They have classes `ColumnTypeMetadata_v2` and `ColumnTypeMetadata_v3`
respectively which contain information about the field name, primitive and
original types. In this method, we are receiving fields with `BINARY` type
taking information about the field type from `ColumnTypeMetadata_v2` or
`ColumnTypeMetadata_v3`.
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