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

Class Metadata_V2.ColumnMetadata_v2

java.lang.Object

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

org.apache.drill.exec.store.parquet.metadata.Metadata_V2.ColumnMetadata_v2

Enclosing class:

Metadata_V2

public static class Metadata_V2.ColumnMetadata_v2
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	Description
static class	Metadata_V2.ColumnMetadata_v2.DeSerializer
static class	Metadata_V2.ColumnMetadata_v2.Serializer

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
ColumnMetadata_v2()
ColumnMetadata_v2(String[] name, org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType, Object mxValue, Long nulls)

Method Summary

Modifier and Type	Method	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 mxValue)	Set the max value recorded in the parquet metadata statistics.
void	setMin(Object newMin)	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 Details

name

public String[] name

nulls

public Long nulls

mxValue

public Object mxValue

Constructor Details

ColumnMetadata_v2

public ColumnMetadata_v2()

ColumnMetadata_v2

public ColumnMetadata_v2(String[] name,
 org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType,
 Object mxValue,
 Long nulls)

Method Details

setMax

public void setMax(Object mxValue)

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 mxValue is not null and nulls count is 0 or if nulls count 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 binary type has only null values, so 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

setMin

public void setMin(Object newMin)

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

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