Uses of Class
ai.rapids.cudf.ColumnView

Packages that use ColumnView

Package	Description
ai.rapids.cudf

Uses of ColumnView in ai.rapids.cudf

Subclasses of ColumnView in ai.rapids.cudf

Modifier and Type	Class and Description
class	ColumnVector This class represents the immutable vector of data.

Methods in ai.rapids.cudf that return ColumnView

Modifier and Type	Method and Description
ColumnView	ColumnView.bitCastTo(DType type) Zero-copy cast between types with the same underlying length.
static ColumnView	ColumnView.fromDeviceBuffer(BaseDeviceMemoryBuffer buffer, long startOffset, DType type, int rows) Create a new column view from a raw device buffer.
ColumnView	ColumnView.getChildColumnView(int childIndex) Returns the child column view at a given index.
ColumnView[]	ColumnView.getChildColumnViews() Returns the child column views for this view Please note that it is the responsibility of the caller to close these views.
ColumnView[]	Scalar.getChildrenFromStructScalar() Fetches views of children columns from struct scalar.
ColumnView	Scalar.getListAsColumnView() Returns the scalar value as a ColumnView.
ColumnView	ColumnView.getListOffsetsView() Get a ColumnView that is the offsets for this list.
ColumnView	ColumnView.logicalCastTo(DType type) Deprecated. this has changed to bit_cast in C++ so use that name instead
static ColumnView	ColumnView.makeStructView(ColumnView... columns) Create a new struct column view of existing column views.
static ColumnView	ColumnView.makeStructView(long rows, ColumnView... columns) Create a new struct column view of existing column views.
ColumnView	ColumnView.replaceChildrenWithViews(int[] indices, ColumnView[] views) This method takes in a nested type and replaces its children with the given views Note: Make sure the numbers of rows in the leaf node are the same as the child replacing it otherwise the list can point to elements outside of the column values.
ColumnView	ColumnView.replaceListChild(ColumnView child) This method takes in a list and returns a new list with the leaf node replaced with the given view.
ColumnView[]	ColumnView.splitAsViews(int... indices) Splits a ColumnView (including null values) into a set of ColumnViews according to a set of indices.
ColumnView	GatherMap.toColumnView(long startRow, int numRows) Create a column view that can be used to perform a gather operation.

Methods in ai.rapids.cudf with parameters of type ColumnView

Modifier and Type	Method and Description
ColumnVector	ColumnView.addCalendricalMonths(ColumnView months) Add the specified number of months to the timestamp.
ColumnVector	ColumnView.applyBooleanMask(ColumnView booleanMaskView) Filters elements in each row of this LIST column using `booleanMaskView` LIST of booleans as a mask.
static void	AssertEmptyNulls.assertNullsAreEmpty(ColumnView cv)
static ColumnVector	ColumnVector.concatenate(ColumnView... columns) Create a new vector by concatenating multiple columns together.
ColumnVector	ColumnView.contains(ColumnView searchSpace) Returns a new column of DType.BOOL8 elements having the same size as this column, each row value is true if the corresponding entry in this column is contained in the given searchSpace column and false if it is not.
void	TableDebug.debug(String name, ColumnView col) Print the contents of a column.
static ColumnVector	Aggregation128Utils.extractInt32Chunk(ColumnView col, DType outType, int chunkIdx) Extract a 32-bit chunk from a 128-bit value.
ColumnVector	ColumnView.extractListElement(ColumnView indices) For each list in this column pull out the entry at the corresponding index specified in the index column.
Table	Table.filter(ColumnView mask) Filters this table using a column of boolean values as a mask, returning a new one.
ColumnVector	ColumnView.findAndReplaceAll(ColumnView oldValues, ColumnView newValues) Returns a vector with all values "oldValues[i]" replaced with "newValues[i]".
Table	Table.gather(ColumnView gatherMap) Gathers the rows of this table according to `gatherMap` such that row "i" in the resulting table's columns will contain row "gatherMap[i]" from this table.
Table	Table.gather(ColumnView gatherMap, OutOfBoundsPolicy outOfBoundsPolicy) Gathers the rows of this table according to `gatherMap` such that row "i" in the resulting table's columns will contain row "gatherMap[i]" from this table.
ColumnVector	ColumnView.getMapKeyExistence(ColumnView keys) For a column of type List> and a passed in key column, return a boolean column for all keys in the map.
ColumnVector	ColumnView.getMapValue(ColumnView keys) Given a column of type List> and a key column of type X, return a column of type Y, where each row in the output column is the Y value corresponding to the X key.
static ColumnVector	DecimalUtils.greaterThan(ColumnView lhs, BigDecimal rhs) Because the native greaterThan operator has issues with comparing decimal values that have different precision and scale accurately.
ColumnVector	ColumnView.ifElse(ColumnView trueValues, ColumnView falseValues) For a BOOL8 vector, computes a vector whose rows are selected from two other vectors based on the boolean value of this vector in the corresponding row.
ColumnVector	ColumnView.ifElse(ColumnView trueValues, Scalar falseValue) For a BOOL8 vector, computes a vector whose rows are selected from two other inputs based on the boolean value of this vector in the corresponding row.
ColumnVector	ColumnView.ifElse(Scalar trueValue, ColumnView falseValues) For a BOOL8 vector, computes a vector whose rows are selected from two other inputs based on the boolean value of this vector in the corresponding row.
static ColumnVector	DecimalUtils.lessThan(ColumnView lhs, BigDecimal rhs) Because the native lessThan operator has issues with comparing decimal values that have different precision and scale accurately.
static ColumnVector	ColumnVector.listConcatenateByRow(boolean ignoreNull, ColumnView... columns) Concatenate columns of lists horizontally (row by row), combining a corresponding row from each column into a single list row of a new column.
static ColumnVector	ColumnVector.listConcatenateByRow(ColumnView... columns) Concatenate columns of lists horizontally (row by row), combining a corresponding row from each column into a single list row of a new column.
ColumnVector	ColumnView.listContainsColumn(ColumnView key) Create a column of bool values indicating whether the list rows of the first column contain the corresponding values in the second column.
static Scalar	Scalar.listFromColumnView(ColumnView list) Creates a scalar of list from a ColumnView.
ColumnVector	ColumnView.listIndexOf(ColumnView keys, ColumnView.FindOptions findOption) Create a column of int32 indices, indicating the position of each row in the search key column in the corresponding row of the lists column.
static ColumnVector	ColumnView.listsDifferenceDistinct(ColumnView lhs, ColumnView rhs) Find the difference of lists of the left column against lists of the right column.
static ColumnVector	ColumnView.listsHaveOverlap(ColumnView lhs, ColumnView rhs) For each pair of lists from the input lists columns, check if they have any common non-null elements.
static ColumnVector	ColumnView.listsIntersectDistinct(ColumnView lhs, ColumnView rhs) Find the intersection without duplicate between lists at each row of the given lists columns.
static ColumnVector	ColumnView.listsUnionDistinct(ColumnView lhs, ColumnView rhs) Find the union without duplicate between lists at each row of the given lists columns.
static ColumnVector	ColumnVector.makeList(ColumnView... columns) Create a LIST column from the given columns.
static ColumnVector	ColumnVector.makeList(long rows, DType type, ColumnView... columns) Create a LIST column from the given columns.
ColumnVector	ColumnVector.makeListFromOffsets(long rows, ColumnView offsets) Create a LIST column from the current column and a given offsets column.
static ColumnVector	ColumnVector.makeStruct(ColumnView... columns) Create a new struct vector made up of existing columns.
static ColumnVector	ColumnVector.makeStruct(long rows, ColumnView... columns) Create a new struct vector made up of existing columns.
static ColumnView	ColumnView.makeStructView(ColumnView... columns) Create a new struct column view of existing column views.
static ColumnView	ColumnView.makeStructView(long rows, ColumnView... columns) Create a new struct column view of existing column views.
static ColumnVector	ColumnVector.md5Hash(ColumnView... columns) Create a new vector containing the MD5 hash of each row in the table.
ColumnVector	ColumnView.mergeAndSetValidity(BinaryOp mergeOp, ColumnView... columns) Create a deep copy of the column while replacing the null mask.
static ColumnVector	DecimalUtils.outOfBounds(ColumnView input, int precision, int scale) With precision and scale, checks each value of input decimal column for out of bound.
PartitionedTable	Table.partition(ColumnView partitionMap, int numberOfPartitions) Partition this table using the mapping in partitionMap.
Table	Table.repeat(ColumnView counts) Create a new table by repeating each row of this table.
ColumnVector	ColumnView.repeatStrings(ColumnView repeatTimes) Given a strings column, an output strings column is generated by repeating each of the input string by a number of times given by the corresponding row in a repeatTimes numeric column.
ColumnView	ColumnView.replaceChildrenWithViews(int[] indices, ColumnView[] views) This method takes in a nested type and replaces its children with the given views Note: Make sure the numbers of rows in the leaf node are the same as the child replacing it otherwise the list can point to elements outside of the column values.
ColumnView	ColumnView.replaceListChild(ColumnView child) This method takes in a list and returns a new list with the leaf node replaced with the given view.
ColumnVector	ColumnView.replaceMultiRegex(String[] patterns, ColumnView repls) For each string, replaces any character sequence matching any of the regular expression patterns with the corresponding replacement strings.
ColumnVector	ColumnView.replaceNulls(ColumnView replacements) Returns a ColumnVector with any null values replaced with the corresponding row in the specified replacement column.
Table	Table.scatter(ColumnView scatterMap, Table target) Scatters values from the source table into the target table out-of-place, returning a new result table.
static Table	Table.scatter(Scalar[] source, ColumnView scatterMap, Table target) Scatters values from the source rows into the target table out-of-place, returning a new result table.
ColumnVector	ColumnView.segmentedGather(ColumnView gatherMap) Segmented gather of the elements within a list element in each row of a list column.
ColumnVector	ColumnView.segmentedGather(ColumnView gatherMap, OutOfBoundsPolicy policy) Segmented gather of the elements within a list element in each row of a list column.
ColumnVector	ColumnView.segmentedReduce(ColumnView offsets, SegmentedReductionAggregation aggregation) Do a segmented reduce where the offsets column indicates which groups in this to combine.
ColumnVector	ColumnView.segmentedReduce(ColumnView offsets, SegmentedReductionAggregation aggregation, DType outType) Do a segmented reduce where the offsets column indicates which groups in this to combine.
ColumnVector	ColumnView.segmentedReduce(ColumnView offsets, SegmentedReductionAggregation aggregation, NullPolicy nullPolicy, DType outType) Do a segmented reduce where the offsets column indicates which groups in this to combine.
static ColumnVector	ColumnVector.sequence(ColumnView start, ColumnView size) Create a list column in which each row is a sequence of values starting from a `start` value, incrementing by one, and its cardinality is specified by a `size` value.
static ColumnVector	ColumnVector.sequence(ColumnView start, ColumnView size, ColumnView step) Create a list column in which each row is a sequence of values starting from a `start` value, incrementing by a `step` value, and its cardinality is specified by a `size` value.
static ColumnVector	ColumnVector.stringConcatenate(ColumnView[] columns) Concatenate columns of strings together, combining a corresponding row from each column into a single string row of a new column with no separator string inserted between each combined string and maintaining null values in combined rows.
static ColumnVector	ColumnVector.stringConcatenate(ColumnView[] columns, ColumnView sepCol) Concatenate columns of strings together using a separator specified for each row and returns the result as a string column.
static ColumnVector	ColumnVector.stringConcatenate(ColumnView[] columns, ColumnView sepCol) Concatenate columns of strings together using a separator specified for each row and returns the result as a string column.
static ColumnVector	ColumnVector.stringConcatenate(ColumnView[] columns, ColumnView sepCol, Scalar separatorNarep, Scalar colNarep, boolean separateNulls) Concatenate columns of strings together using a separator specified for each row and returns the result as a string column.
static ColumnVector	ColumnVector.stringConcatenate(ColumnView[] columns, ColumnView sepCol, Scalar separatorNarep, Scalar colNarep, boolean separateNulls) Concatenate columns of strings together using a separator specified for each row and returns the result as a string column.
static ColumnVector	ColumnVector.stringConcatenate(Scalar separator, Scalar narep, ColumnView[] columns) Concatenate columns of strings together, combining a corresponding row from each column into a single string row of a new column.
static ColumnVector	ColumnVector.stringConcatenate(Scalar separator, Scalar narep, ColumnView[] columns, boolean separateNulls) Concatenate columns of strings together, combining a corresponding row from each column into a single string row of a new column.
ColumnVector	ColumnView.stringConcatenateListElements(ColumnView sepCol) Given a lists column of strings (each row is a list of strings), concatenates the strings within each row and returns a single strings column result.
ColumnVector	ColumnView.stringConcatenateListElements(ColumnView sepCol, Scalar separatorNarep, Scalar stringNarep, boolean separateNulls, boolean emptyStringOutputIfEmptyList) Given a lists column of strings (each row is a list of strings), concatenates the strings within each row and returns a single strings column result.
ColumnVector	ColumnView.stringReplace(ColumnView targets, ColumnView repls) Returns a new strings column where target strings with each string are replaced with corresponding replacement strings.
static Scalar	Scalar.structFromColumnViews(ColumnView... columns) Creates a scalar of struct from a ColumnView.
ColumnVector	ColumnView.substring(ColumnView start, ColumnView end) Returns a new strings column that contains substrings of the strings in the provided column which uses unique ranges for each string
static void	Table.writeColumnViewsToParquet(ParquetWriterOptions options, HostBufferConsumer consumer, ColumnView... columnViews)
static void	Table.writeColumnViewsToParquet(ParquetWriterOptions options, HostBufferConsumer consumer, HostMemoryAllocator hostMemoryAllocator, ColumnView... columnViews) This is an evolving API and most likely be removed in future releases.

Constructors in ai.rapids.cudf with parameters of type ColumnView

Constructor and Description
ColumnView(DType type, long rows, Optional<Long> nullCount, BaseDeviceMemoryBuffer validityBuffer, BaseDeviceMemoryBuffer offsetBuffer, ColumnView[] children) Create a new column view based off of data already on the device.