Package org.apache.drill.exec.record.metadata

Class RepeatedListColumnMetadata

java.lang.Object

org.apache.drill.exec.record.metadata.AbstractPropertied

org.apache.drill.exec.record.metadata.AbstractColumnMetadata

org.apache.drill.exec.record.metadata.RepeatedListColumnMetadata

All Implemented Interfaces:

ColumnMetadata, Propertied

public class RepeatedListColumnMetadata
extends AbstractColumnMetadata

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.exec.record.metadata.ColumnMetadata

ColumnMetadata.StructureType

Field Summary

Fields

Modifier and Type	Field	Description
static final int	UNKNOWN_DIMENSIONS	Indicates we don't know the number of dimensions.

Fields inherited from class org.apache.drill.exec.record.metadata.AbstractColumnMetadata

mode, name, precision, scale, type

Fields inherited from interface org.apache.drill.exec.record.metadata.ColumnMetadata

BLANK_AS_NULL, BLANK_AS_PROP, BLANK_AS_ZERO, DEFAULT_ARRAY_SIZE, DEFAULT_VALUE_PROP, EXCLUDE_FROM_WILDCARD, EXPECTED_CARDINALITY_PROP, EXPECTED_WIDTH_PROP, FORMAT_PROP, IMPLICIT_COL_TYPE, IMPLICIT_FILENAME, IMPLICIT_FILEPATH, IMPLICIT_FQN, IMPLICIT_PARTITION_PREFIX, IMPLICIT_SUFFIX

Fields inherited from interface org.apache.drill.exec.record.metadata.Propertied

DRILL_PROP_PREFIX

Constructor Summary

Constructors

Constructor	Description
RepeatedListColumnMetadata(String name, ColumnMetadata childSchema)
RepeatedListColumnMetadata(MaterializedField field)

Method Summary

Modifier and Type	Method	Description
protected void	appendContents(StringBuilder buf)
ColumnMetadata	childSchema()	Schema of inner dimension for MULTI_ARRAY columns.
void	childSchema(ColumnMetadata childMetadata)
ColumnMetadata	cloneEmpty()	Create an empty version of this column.
ColumnMetadata	copy()
int	dimensions()
MaterializedField	emptySchema()
boolean	isEquivalent(ColumnMetadata o)	Report whether one column is equivalent to another.
boolean	isMultiList()	Determine if the schema represents a column with a LIST type with UNION elements.
MaterializedField	schema()
ColumnMetadata.StructureType	structureType()
String	typeString()	Converts type metadata into string representation accepted by the table schema parser.

Methods inherited from class org.apache.drill.exec.record.metadata.AbstractColumnMetadata

bind, columnString, createColumnMetadata, dateTimeFormatter, decodeDefaultValue, defaultValue, equals, equalsWithProperties, equalsWithProperties, escapeSpecialSymbols, expectedElementCount, expectedWidth, format, isArray, isDict, isDynamic, isMap, isNullable, isScalar, isVariableWidth, isVariant, majorType, mode, name, precision, properties, scale, setDefaultValue, setExpectedElementCount, setExpectedWidth, setFormat, toString, tupleSchema, type, valueFromString, valueToString, variantSchema

Methods inherited from class org.apache.drill.exec.record.metadata.AbstractPropertied

booleanProperty, booleanProperty, hashCode, hasProperties, intProperty, intProperty, property, property, removeProperty, setBooleanProperty, setIntProperty, setProperties, setProperty

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.drill.exec.record.metadata.Propertied

booleanProperty, booleanProperty, hasProperties, intProperty, intProperty, property, property, removeProperty, setBooleanProperty, setIntProperty, setProperties, setProperty

Field Details

UNKNOWN_DIMENSIONS

public static final int UNKNOWN_DIMENSIONS

Indicates we don't know the number of dimensions.

See Also:

• Constant Field Values

Constructor Details

RepeatedListColumnMetadata

public RepeatedListColumnMetadata(MaterializedField field)

RepeatedListColumnMetadata

public RepeatedListColumnMetadata(String name,
 ColumnMetadata childSchema)

Method Details

childSchema

public void childSchema(ColumnMetadata childMetadata)

structureType

public ColumnMetadata.StructureType structureType()

isMultiList

public boolean isMultiList()

Description copied from interface: ColumnMetadata

Determine if the schema represents a column with a LIST type with UNION elements. (Lists can be of a single type (with nullable elements) or can be of unions.)

Specified by:

isMultiList in interface ColumnMetadata

Overrides:

isMultiList in class AbstractColumnMetadata

Returns:

true if the column is of type LIST of UNIONs

schema

public MaterializedField schema()

emptySchema

public MaterializedField emptySchema()

cloneEmpty

public ColumnMetadata cloneEmpty()

Description copied from interface: ColumnMetadata

Create an empty version of this column. If the column is a scalar, produces a simple copy. If a map, produces a clone without child columns.

Returns:

empty clone of this column

copy

public ColumnMetadata copy()

childSchema

public ColumnMetadata childSchema()

Description copied from interface: ColumnMetadata

Schema of inner dimension for MULTI_ARRAY columns. If an array is 3D, the outer column represents all 3 dimensions. outer.childSchema() gives another MULTI_ARRAY for the inner 2D array. outer.childSchema().childSchema() gives a column of some other type (but repeated) for the 1D array.

Sorry for the mess, but it is how the code works and we are not in a position to revisit data type fundamentals.

Specified by:

childSchema in interface ColumnMetadata

Overrides:

childSchema in class AbstractColumnMetadata

Returns:

the description of the (n-1) st dimension.

dimensions

public int dimensions()

Specified by:

dimensions in interface ColumnMetadata

Overrides:

dimensions in class AbstractColumnMetadata

typeString

public String typeString()

Description copied from interface: ColumnMetadata

Converts type metadata into string representation accepted by the table schema parser.

Specified by:

typeString in interface ColumnMetadata

Specified by:

typeString in class AbstractColumnMetadata

Returns:

type metadata string representation

appendContents

protected void appendContents(StringBuilder buf)

Overrides:

appendContents in class AbstractColumnMetadata

isEquivalent

public boolean isEquivalent(ColumnMetadata o)

Description copied from interface: ColumnMetadata

Report whether one column is equivalent to another. Columns are equivalent if they have the same name, type and structure (ignoring internal structure such as properties.)

Specified by:

isEquivalent in interface ColumnMetadata

Overrides:

isEquivalent in class AbstractColumnMetadata