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

Class Metadata_V1.ColumnMetadata_v1

java.lang.Object

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

org.apache.drill.exec.store.parquet.metadata.Metadata_V1.ColumnMetadata_v1

Enclosing class:

Metadata_V1

public static class Metadata_V1.ColumnMetadata_v1
extends MetadataBase.ColumnMetadata

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

Field Summary

Fields

Modifier and Type	Field	Description
Object	max
Object	min
SchemaPath	name
Long	nulls
org.apache.parquet.schema.OriginalType	originalType
org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName	primitiveType

Constructor Summary

Constructors

Constructor	Description
ColumnMetadata_v1()
ColumnMetadata_v1(SchemaPath name, org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType, org.apache.parquet.schema.OriginalType originalType, Object max, Object min, Long nulls)

Method Summary

Modifier and Type	Method	Description
Object	getMax()
Object	getMaxValue()
Object	getMin()
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 max)	setter used during deserialization of the 'max' field of the metadata cache file.
void	setMin(Object min)	setter used during deserialization of the 'min' field of the metadata cache file.

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 SchemaPath name

primitiveType

public org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType

originalType

public org.apache.parquet.schema.OriginalType originalType

nulls

public Long nulls

max

public Object max

min

public Object min

Constructor Details

ColumnMetadata_v1

public ColumnMetadata_v1()

ColumnMetadata_v1

public ColumnMetadata_v1(SchemaPath name,
 org.apache.parquet.schema.PrimitiveType.PrimitiveTypeName primitiveType,
 org.apache.parquet.schema.OriginalType originalType,
 Object max,
 Object min,
 Long nulls)

Method Details

getMin

public Object getMin()

getMax

public Object getMax()

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

setMin

public void setMin(Object min)

setter used during deserialization of the 'min' field of the metadata cache file.

Specified by:

setMin in class MetadataBase.ColumnMetadata

Parameters:

min -

setMax

public void setMax(Object max)

setter used during deserialization of the 'max' field of the metadata cache file.

Specified by:

setMax in class MetadataBase.ColumnMetadata

Parameters:

max -

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 min and max are the same but not null and nulls count is 0 or equal to the rows count.

Returns true if min and max 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