io.delta.kernel.internal.util

Class InternalUtils

Object

io.delta.kernel.internal.util.InternalUtils

public class InternalUtils
extends Object

Method Summary

Modifier and Type	Method and Description
static int	daysSinceEpoch(java.sql.Date date) Utility method to get the number of days since epoch this given date is.
static <T> java.util.Optional<T>	getSingularElement(CloseableIterator<T> iter) Utility method to read at most one element from a CloseableIterator.
static java.util.Optional<Row>	getSingularRow(CloseableIterator<ColumnarBatch> dataIter) Utility method to read at most one row from the given data ColumnarBatch iterator.
static long	microsSinceEpoch(java.sql.Timestamp timestamp) Utility method to get the number of microseconds since the unix epoch for the given timestamp interpreted in UTC.
static Path	relativizePath(Path child, java.net.URI root) Relativize the given child path with respect to the given root URI.
static ColumnVector	requireNonNull(ColumnVector vector, int rowId, String columnName)
static Row	requireNonNull(Row row, int ordinal, String columnName)
static ColumnVector	singletonStringColumnVector(String value) Utility method to create a singleton string ColumnVector
static java.util.Set<String>	toLowerCaseSet(java.util.Collection<String> set)

Methods inherited from class Object

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

Method Detail

getSingularRow

public static java.util.Optional<Row> getSingularRow(CloseableIterator<ColumnarBatch> dataIter)
                                              throws java.io.IOException

Utility method to read at most one row from the given data ColumnarBatch iterator. If there is more than one row, an exception will be thrown.

Parameters:

dataIter -

Returns:

Throws:

java.io.IOException

getSingularElement

public static <T> java.util.Optional<T> getSingularElement(CloseableIterator<T> iter)
                                                    throws java.io.IOException

Utility method to read at most one element from a CloseableIterator. If there is more than element row, an exception will be thrown.

Throws:

java.io.IOException

daysSinceEpoch

public static int daysSinceEpoch(java.sql.Date date)

Utility method to get the number of days since epoch this given date is.

microsSinceEpoch

public static long microsSinceEpoch(java.sql.Timestamp timestamp)

Utility method to get the number of microseconds since the unix epoch for the given timestamp interpreted in UTC.

singletonStringColumnVector

public static ColumnVector singletonStringColumnVector(String value)

Utility method to create a singleton string ColumnVector

Parameters:

value - the string element to create the vector with

Returns:

A ColumnVector with a single element value

requireNonNull

public static Row requireNonNull(Row row,
                                 int ordinal,
                                 String columnName)

requireNonNull

public static ColumnVector requireNonNull(ColumnVector vector,
                                          int rowId,
                                          String columnName)

relativizePath

public static Path relativizePath(Path child,
                                  java.net.URI root)

Relativize the given child path with respect to the given root URI. If the child path is already a relative path, it is returned as is.

Parameters:

child -

root - Root directory as URI. Relativization is done with respect to this root. The relativize operation requires conversion to URI, so the caller is expected to convert the root directory to URI once and use it for relativizing for multiple child paths.

Returns:

toLowerCaseSet

public static java.util.Set<String> toLowerCaseSet(java.util.Collection<String> set)