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From arina-ielchiieva <...@git.apache.org>
Subject [GitHub] drill pull request #805: Drill-4139: Exception while trying to prune partiti...
Date Fri, 21 Apr 2017 10:36:52 GMT
Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/805#discussion_r112660688
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetReaderUtility.java
---
    @@ -181,6 +185,71 @@ else if (parquetTableMetadata instanceof Metadata.ParquetTableMetadata_v2
&&
       }
     
       /**
    +   * Checks that the metadata file was created by drill with version less that
    +   * 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
    +   */
    +  public static void correctBinaryInMetadataCache(Metadata.ParquetTableMetadataBase parquetTableMetadata)
{
    +    if (hasOldBinarySerialization(parquetTableMetadata)) {
    +      Set<List<String>> names = Sets.newHashSet();
    +      if (parquetTableMetadata instanceof Metadata.ParquetTableMetadata_v2) {
    +        for (Metadata.ColumnTypeMetadata_v2 columnTypeMetadata :
    +            ((Metadata.ParquetTableMetadata_v2) parquetTableMetadata).columnTypeInfo.values())
{
    +          if (columnTypeMetadata.primitiveType == PrimitiveTypeName.BINARY) {
    +            names.add(Arrays.asList(columnTypeMetadata.name));
    +          }
    +        }
    +      }
    +      for (Metadata.ParquetFileMetadata file : parquetTableMetadata.getFiles()) {
    +        // Drill has only ever written a single row group per file, only need to correct
the statistics
    +        // on the first row group
    +        Metadata.RowGroupMetadata rowGroupMetadata = file.getRowGroups().get(0);
    +        for (Metadata.ColumnMetadata columnMetadata : rowGroupMetadata.getColumns())
{
    +          // Setting Min/Max values for ParquetTableMetadata_v1
    +          if (parquetTableMetadata instanceof Metadata.ParquetTableMetadata_v1
    +                || parquetTableMetadata instanceof Metadata.ParquetTableMetadata_v3)
{
    +            PrimitiveTypeName primitiveType = columnMetadata.getPrimitiveType();
    +            if (primitiveType == PrimitiveTypeName.BINARY && columnMetadata.hasSingleValue())
{
    +              Object minValue = columnMetadata.getMinValue();
    +              if (minValue != null && minValue instanceof String) {
    +                byte[] bytes = ((String) minValue).getBytes();
    +                columnMetadata.setMax(bytes);
    +                columnMetadata.setMin(bytes);
    +              }
    +            }
    +          }
    +          // Setting Max values for ParquetTableMetadata_v2
    +          else if (parquetTableMetadata instanceof Metadata.ParquetTableMetadata_v2
    +                    && columnMetadata.hasSingleValue()
    +                    && names.contains(Arrays.asList(columnMetadata.getName())))
{
    +            Object maxValue = columnMetadata.getMaxValue();
    +            if (maxValue != null && maxValue instanceof String) {
    +              byte[] bytes = ((String) maxValue).getBytes();
    +              columnMetadata.setMax(bytes);
    +            }
    +          }
    +        }
    +      }
    +    }
    +  }
    +
    +  /**
    +   * Checks that the metadata file was created by drill with version less that
    +   * the version where was changed the serialization of BINARY values.
    +   *
    +   * @param parquetTableMetadata the source of drill version
    +   * @return true if metadata file was created by drill with version less that
    +   * the version where was changed the serialization of BINARY values
    +   */
    +  public static boolean hasOldBinarySerialization(Metadata.ParquetTableMetadataBase parquetTableMetadata)
{
    +    String drillVersion = parquetTableMetadata.getDrillVersion();
    +    return drillVersion == null
    +            || new ComparableVersion(drillVersion).compareTo(new ComparableVersion("1.11.0-SNAPSHOT"))
< 0;
    --- End diff --
    
    I am not sure that using version with SNAPSHOT is correct.


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