Package org.apache.drill.exec.store.parquet.metadata

Class MetadataVersion.Constants

java.lang.Object

org.apache.drill.exec.store.parquet.metadata.MetadataVersion.Constants

Enclosing class:

MetadataVersion

public static class MetadataVersion.Constants
extends Object

Supported metadata versions.

Note: keep them synchronized with MetadataBase.ParquetTableMetadataBase versions

Field Summary

Fields

Modifier and Type	Field	Description
static final SortedSet<MetadataVersion>	SUPPORTED_VERSIONS	All historical versions of the Drill metadata cache files.
static final String	V1	Version 1: Introduces parquet file metadata caching. See DRILL-2743
static final String	V2	Version 2: Metadata cache file size is reduced. See DRILL-4053
static final String	V3	Version 3: Difference between v3 and v2 : min/max, type_length, precision, scale, repetitionLevel, definitionLevel. Filter pushdown for Parquet is implemented.
static final String	V3_1	Version 3.1: Absolute paths of files and directories are replaced with relative ones.
static final String	V3_2	Version 3.2: An array with the components of the field name in Metadata_V3.ColumnTypeMetadata_v3.Key class is replaced by the SchemaPath. See DRILL-4264
static final String	V3_3	Version 3.3: Changed serialization of BINARY and FIXED_LEN_BYTE_ARRAY fields. See DRILL-4139
static final String	V4	Version 4.0: Split the metadata cache file into summary and file metadata
static final String	V4_1	Version 4.1: Added parents' original types in Metadata_V4.ColumnTypeMetadata_v4 and Metadata_V4.ColumnMetadata_v4
static final String	V4_2	Version 4.2: Added Type.Repetition to Metadata_V4.ColumnTypeMetadata_v4.

Constructor Summary

Constructors

Constructor	Description
Constants()

Method Summary

Modifier and Type	Method	Description
static boolean	isVersionSupported(String metadataVersion)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

V1

public static final String V1

Version 1: Introduces parquet file metadata caching.
See DRILL-2743

See Also:

• Constant Field Values

V2

public static final String V2

Version 2: Metadata cache file size is reduced.
See DRILL-4053

See Also:

• Constant Field Values

V3

public static final String V3

Version 3: Difference between v3 and v2 : min/max, type_length, precision, scale, repetitionLevel, definitionLevel.
Filter pushdown for Parquet is implemented.
See DRILL-1950

See Also:

• Constant Field Values

V3_1

public static final String V3_1

Version 3.1: Absolute paths of files and directories are replaced with relative ones. Metadata version value doesn't contain `v` letter
See DRILL-3867, DRILL-5660

See Also:

• Constant Field Values

V3_2

public static final String V3_2

Version 3.2: An array with the components of the field name in Metadata_V3.ColumnTypeMetadata_v3.Key class is replaced by the SchemaPath.
See DRILL-4264

See Also:

• Constant Field Values

V3_3

public static final String V3_3

Version 3.3: Changed serialization of BINARY and FIXED_LEN_BYTE_ARRAY fields.
See DRILL-4139

See Also:

• Constant Field Values

V4

public static final String V4

Version 4.0: Split the metadata cache file into summary and file metadata

See Also:

• Constant Field Values

V4_1

public static final String V4_1

Version 4.1: Added parents' original types in Metadata_V4.ColumnTypeMetadata_v4 and Metadata_V4.ColumnMetadata_v4

See Also:

• Constant Field Values

V4_2

public static final String V4_2

Version 4.2: Added Type.Repetition to Metadata_V4.ColumnTypeMetadata_v4.

See Also:

• Constant Field Values

SUPPORTED_VERSIONS

public static final SortedSet<MetadataVersion> SUPPORTED_VERSIONS

All historical versions of the Drill metadata cache files. In case of introducing a new parquet metadata version please follow the MetadataVersion.FORMAT.

Constructor Details

Constants

public Constants()

Method Details

isVersionSupported

public static boolean isVersionSupported(String metadataVersion)

Parameters:

metadataVersion - string representation of the parquet metadata version

Returns:

true if metadata version is supported, false otherwise