Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/877#discussion_r127365148
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/Metadata.java
---
@@ -1851,9 +1860,81 @@ private static String relativize(String baseDir,
String childPath) {
.relativize(fullPathWithoutSchemeAndAuthority.toUri()));
if (relativeFilePath.isAbsolute()) {
throw new IllegalStateException(String.format("Path %s is not a
subpath of %s.",
- basePathWithoutSchemeAndAuthority.toUri().toString(),
fullPathWithoutSchemeAndAuthority.toUri().toString()));
+ basePathWithoutSchemeAndAuthority.toUri().getPath(),
fullPathWithoutSchemeAndAuthority.toUri().getPath()));
+ }
+ return relativeFilePath.toUri().getPath();
+ }
+ }
+
+ /**
+ * Used to identify metadata version by the deserialization
"metadata_version" first property
+ * from the metadata cache file
+ */
+ public static class MetadataVersion {
+ @JsonProperty("metadata_version")
+ public String textVersion;
+
+ /**
+ * Supported metadata versions.
+ * Note: keep them synchronized with {@link ParquetTableMetadataBase}
versions
+ */
+ enum Versions {
+ v1(Constants.V1),
+ v2(Constants.V2),
+ v3(Constants.V3),
+ v3_1(Constants.V3_1);
+
+ private final String version;
+
+ Versions(String version) {
+ this.version = version;
+ }
+
+ public String getVersion() {
+ return version;
+ }
+
+ public static Versions fromString(String version) {
+ for (Versions v : Versions.values()) {
+ if (v.version.equalsIgnoreCase(version)) {
+ return v;
+ }
+ }
+ return null;
+ }
+
+ public static class Constants {
+ public static final String V1 = "v1";
+ public static final String V2 = "v2";
+ public static final String V3 = "v3";
+ public static final String V3_1 = "v3_1";
+ }
+ }
+
+ /**
+ * @param fs current file system
+ * @param path of metadata cache file
+ * @return true if metadata version is supported, false otherwise
+ * @throws IOException if parquet metadata can't be deserialized from
the json file
+ */
+ public static boolean isVersionSupported(FileSystem fs, Path path)
throws IOException {
--- End diff --
Not now, but in the future, separate the Jackson-serialized persistence
class from the code which works with that data. The persistence class just has
the fields for the data and simple related operations. Code that works with the
data should be in a separate class.
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