Github user paul-rogers commented on a diff in the pull request:

    https://github.com/apache/drill/pull/877#discussion_r127364840
  
    --- 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";
    +      }
    +    }
    +
    +    /**
    --- End diff --
    
    One very handy thing to do for each version constant is to list what 
changed, possibly including the JIRA number for more information:
    
    ```
    /**
     * Version 3.1: Changes the xyz property.
     * File names stored as relative paths.
     * See DRILL-1234.
     */
    ```


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