Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/877#discussion_r132405168
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/MetadataVersion.java
 ---
    @@ -0,0 +1,156 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +package org.apache.drill.exec.store.parquet;
    +
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.ComparisonChain;
    +import com.google.common.collect.ImmutableSortedSet;
    +import org.apache.drill.common.exceptions.DrillRuntimeException;
    +
    +import java.util.SortedSet;
    +import java.util.regex.Matcher;
    +import java.util.regex.Pattern;
    +
    +
    +public class MetadataVersion implements Comparable<MetadataVersion> {
    +
    +  private static final String FORMAT = "v?((?!0)\\d+)(\\.(\\d+))?";
    +  private static final Pattern PATTERN = Pattern.compile(FORMAT);
    +
    +  private final int major;
    +  private final int minor;
    +
    +  public MetadataVersion(int major, int minor) {
    +    this.major = major;
    +    this.minor = minor;
    +  }
    +
    +  public MetadataVersion(String metadataVersion) {
    +    Matcher matcher = PATTERN.matcher(metadataVersion);
    +    if (!matcher.matches()) {
    +      DrillRuntimeException.format("Could not parse metadata version '%s' 
using format '%s'", metadataVersion, FORMAT);
    +    }
    +    this.major = Integer.parseInt(matcher.group(1));
    +    this.minor = matcher.group(3) != null ? 
Integer.parseInt(matcher.group(3)) : 0;
    +  }
    +
    +  public int getMajor() {
    +    return major;
    +  }
    +
    +  public int getMinor() {
    +    return minor;
    +  }
    +
    +  @Override
    +  public boolean equals(Object o) {
    +    if (this == o) {
    +      return true;
    +    }
    +    if (!(o instanceof MetadataVersion)) {
    +      return false;
    +    }
    +    MetadataVersion that = (MetadataVersion) o;
    +    return this.major == that.major
    +        && this.minor == that.minor;
    +  }
    +
    +  @Override
    +  public int hashCode() {
    +    int result = major;
    +    result = 31 * result + minor;
    +    return result;
    +  }
    +
    +  /**
    +   * @return string representation of the metadata file version, for 
example: "v1", "v10", "v4.13"
    +   * <p>
    +   * String metadata version consists of the following characters:<p>
    +   * optional "v" letter,<p>
    --- End diff --
    
    In our case `toString()` method won't return result with "v", so I guess we 
can remove this sentence.


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