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

Class Metadata_V3.ColumnMetadata_v3

java.lang.Object

org.apache.drill.exec.store.parquet.metadata.MetadataBase.ColumnMetadata

org.apache.drill.exec.store.parquet.metadata.Metadata_V3.ColumnMetadata_v3

Direct Known Subclasses:

Metadata_V4.ColumnMetadata_v4

Enclosing class:

Metadata_V3

public static class Metadata_V3.ColumnMetadata_v3
extends MetadataBase.ColumnMetadata

A struct that contains the metadata for a column in a parquet file

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Metadata_V3.ColumnMetadata_v3.Serializer

Field Summary

Fields

Modifier and Type	Field and Description
Object	maxValue
Object	minValue
String[]	name
Long	nulls

Constructor Summary

Constructors

Constructor and Description
ColumnMetadata_v3()
ColumnMetadata_v3(String[] name, org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType, Object minValue, Object maxValue, Long nulls)

Method Summary

Modifier and Type	Method and Description
Object	getMaxValue()
Object	getMinValue()
String[]	getName()
Long	getNulls()
org.apache.parquet.schema.OriginalType	getOriginalType()
org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName	getPrimitiveType()
boolean	hasSingleValue(long rowCount) Checks that the column chunk has a single value.
void	setMax(Object maxValue) Set the max value recorded in the parquet metadata statistics.
void	setMin(Object minValue) Set the min value recorded in the parquet metadata statistics.

Methods inherited from class org.apache.drill.exec.store.parquet.metadata.MetadataBase.ColumnMetadata

isNumNullsSet

Methods inherited from class java.lang.Object

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

Field Detail

name

public String[] name

nulls

public Long nulls

minValue

public Object minValue

maxValue

public Object maxValue

Constructor Detail

ColumnMetadata_v3

public ColumnMetadata_v3()

ColumnMetadata_v3

public ColumnMetadata_v3(String[] name,
                         org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType,
                         Object minValue,
                         Object maxValue,
                         Long nulls)

Method Detail

setMin

public void setMin(Object minValue)

Description copied from class: MetadataBase.ColumnMetadata

Set the min value recorded in the parquet metadata statistics. This object would just be immutable, but due to Drill-4203 we need to correct date values that had been corrupted by earlier versions of Drill.

Specified by:

setMin in class MetadataBase.ColumnMetadata

setMax

public void setMax(Object maxValue)

Description copied from class: MetadataBase.ColumnMetadata

Set the max value recorded in the parquet metadata statistics. This object would just be immutable, but due to Drill-4203 we need to correct date values that had been corrupted by earlier versions of Drill.

Specified by:

setMax in class MetadataBase.ColumnMetadata

getName

public String[] getName()

Specified by:

getName in class MetadataBase.ColumnMetadata

getNulls

public Long getNulls()

Specified by:

getNulls in class MetadataBase.ColumnMetadata

hasSingleValue

public boolean hasSingleValue(long rowCount)

Checks that the column chunk has a single value. Returns true if minValue and maxValue are the same but not null and nulls count is 0 or equal to the rows count.

Returns true if minValue and maxValue are null and the number of null values in the column chunk is equal to the rows count.

Comparison of nulls and rows count is needed for the cases:

• column with primitive type has single value and null values
• column with primitive type has only null values, min/max couldn't be null, but column has single value

Specified by:

hasSingleValue in class MetadataBase.ColumnMetadata

Parameters:

rowCount - rows count in column chunk

Returns:

true if column has single value

getMinValue

public Object getMinValue()

Specified by:

getMinValue in class MetadataBase.ColumnMetadata

getMaxValue

public Object getMaxValue()

Specified by:

getMaxValue in class MetadataBase.ColumnMetadata

getPrimitiveType

public org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName getPrimitiveType()

Specified by:

getPrimitiveType in class MetadataBase.ColumnMetadata

getOriginalType

public org.apache.parquet.schema.OriginalType getOriginalType()

Specified by:

getOriginalType in class MetadataBase.ColumnMetadata