Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/877#discussion_r127322815
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/Metadata.java
---
@@ -658,11 +657,21 @@ private boolean tableModified(List<String>
directories, Path metaFilePath,
return false;
}
+ /**
+ * Basic class for parquet metadata. Inheritors of this class are json
serializable structures of
+ * different versions metadata cache files.
+ *
+ * Bump up metadata major version if metadata structure is changed.
+ * Bump up metadata minor version if only metadata content is changed,
but metadata structure is the same.
+ *
+ * Note: keep metadata versions synchronized with {@link
MetadataVersion.Versions}
+ */
@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include =
JsonTypeInfo.As.PROPERTY, property = "metadata_version")
@JsonSubTypes({
- @JsonSubTypes.Type(value = ParquetTableMetadata_v1.class, name="v1"),
- @JsonSubTypes.Type(value = ParquetTableMetadata_v2.class, name="v2"),
- @JsonSubTypes.Type(value = ParquetTableMetadata_v3.class, name="v3")
+ @JsonSubTypes.Type(value = ParquetTableMetadata_v1.class, name =
MetadataVersion.Versions.Constants.V1),
--- End diff --
Can be replaced with `Version.V1.getName()`?
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