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Engine Table: Implementation and closely-coupled utilities
/**
* Copyright (c) 2016-2023 Deephaven Data Labs and Patent Pending
*/
package io.deephaven.engine.table.impl;
import io.deephaven.base.verify.Assert;
import io.deephaven.engine.rowset.RowSet;
import io.deephaven.engine.rowset.RowSetBuilderSequential;
import io.deephaven.engine.rowset.RowSetFactory;
import io.deephaven.engine.rowset.WritableRowSet;
import io.deephaven.engine.table.ColumnSource;
import io.deephaven.engine.table.ModifiedColumnSet;
import io.deephaven.engine.table.Table;
import io.deephaven.engine.table.TableUpdate;
import io.deephaven.engine.table.impl.perf.QueryPerformanceRecorder;
import io.deephaven.engine.table.impl.select.MatchPairFactory;
import io.deephaven.engine.table.impl.sources.ShiftedColumnSource;
import org.apache.commons.lang3.mutable.MutableLong;
import org.jetbrains.annotations.NotNull;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;
/**
* Tools for creating a new ShiftedColumn(s) for a given input table and a source column(s)
*/
public class ShiftedColumnOperation {
// static use only
private ShiftedColumnOperation() {}
/**
* Creates a new table that has all the columns of the source table plus includes the new shifted column(s).
*
* @param source source table
* @param shift the positive or negative shift value
* @param matchColumns the source and shifted column pair(s) as shifted=source for example "X1=X", "Y1=Y"...
* @return a new Table that includes the shifted column
*/
public static Table addShiftedColumns(@NotNull Table source, long shift, @NotNull String... matchColumns) {
String nuggetName = "addShiftedColumns ( " + shift + " , " + String.join(",", matchColumns) + ") ";
return getShiftedColumnsUsingNugget(nuggetName, source, shift, MatchPairFactory.getExpressions(matchColumns));
}
/**
* Creates a new table that has all the columns of the source table plus includes the new shifted column(s).
*
* @param source the source table, used to create new table with the shifted column
* @param shift the constant shift value
* @param matchPairs the source and shifted column pair(s) as shifted=source match pairs
* @return a new Table that has all columns from source table plus additional shifted column(s) that are created
* using the shift from their source column(s)
*/
public static Table addShiftedColumns(@NotNull Table source, long shift,
@NotNull MatchPair... matchPairs) {
String nuggetName = "addShiftedColumns ( shift , matchPairs )";
return getShiftedColumnsUsingNugget(nuggetName, source, shift, matchPairs);
}
/**
* Delegates to {@link ShiftedColumnOperation#getShiftedColumns(Table, long, MatchPair...)} using
* QueryPerformanceRecorder.
*
* @param source the source table, used to create new table with the shifted column
* @param shift the constant shift value
* @param pairs the source and shifted column pair(s) as shifted=source match pairs
* @return a new Table that has all columns from source table plus additional shifted column(s) that are created
* using the shift from their source column(s)
*/
@NotNull
private static Table getShiftedColumnsUsingNugget(
@NotNull String nuggetName, @NotNull Table source, long shift, @NotNull MatchPair... pairs) {
return QueryPerformanceRecorder.withNugget(nuggetName, source.sizeForInstrumentation(),
() -> getShiftedColumns(source, shift, pairs));
}
/**
* Encapsulates the logic to create and return a new Table that has all the columns from input table plus an
* additional shifted column(s) that is based on the given source column(s) and the shift.
*
* @param source the source table, used to create new table with the shifted column
* @param shift the constant shift value, must be non-zero
* @param pairs the source and shifted column pair(s) as shifted=source match pairs
* @return a new Table that has all columns from input table plus additional shifted column(s) that are created
* using the shift from their source column(s)
*/
@NotNull
private static Table getShiftedColumns(@NotNull Table source, long shift, @NotNull MatchPair... pairs) {
Assert.neqZero(shift, "shift");
final Map> columnSourceMap = new LinkedHashMap<>(source.getColumnSourceMap());
final Map> sourceToShiftModColSetMap = new LinkedHashMap<>();
final Set sourceColumns = new LinkedHashSet<>();
final Set shiftedColumns = new LinkedHashSet<>();
Arrays.stream(pairs).forEach(pair -> {
columnSourceMap.put(pair.leftColumn, new ShiftedColumnSource<>(
source.getRowSet(), source.getColumnSource(pair.rightColumn), shift));
Set set = sourceToShiftModColSetMap.computeIfAbsent(pair.rightColumn, s -> new LinkedHashSet<>());
set.add(pair.rightColumn);
set.add(pair.leftColumn);
sourceColumns.add(pair.rightColumn);
shiftedColumns.add(pair.leftColumn);
});
final QueryTable result = new QueryTable(source.getRowSet(), columnSourceMap);
final Set resultTableMCSs = new LinkedHashSet<>();
Arrays.stream(source.getDefinition().getColumnNamesArray()).forEach(colName -> {
if (sourceToShiftModColSetMap.containsKey(colName)) {
resultTableMCSs.add(result.newModifiedColumnSet(
sourceToShiftModColSetMap.get(colName).toArray(String[]::new)));
} else {
// add identity mapping for all other columns
resultTableMCSs.add(result.newModifiedColumnSet(colName));
}
});
final QueryTable sourceAsQueryTable = (QueryTable) source;
final ModifiedColumnSet sourceColumnSet =
sourceAsQueryTable.newModifiedColumnSet(sourceColumns.toArray(String[]::new));
final ModifiedColumnSet dirtyColumnSet = result.newModifiedColumnSet(shiftedColumns.toArray(String[]::new));
final ModifiedColumnSet downstreamColumnSet = result.getModifiedColumnSetForUpdates();
final ModifiedColumnSet.Transformer mcsTransformer = sourceAsQueryTable.newModifiedColumnSetTransformer(
source.getDefinition().getColumnNamesArray(), resultTableMCSs.toArray(ModifiedColumnSet[]::new));
if (source.isRefreshing()) {
final BaseTable.ListenerImpl listener = new BaseTable.ListenerImpl("propagateUpdates", source, result) {
@Override
public void onUpdate(TableUpdate upstream) {
final TableUpdateImpl downstream = TableUpdateImpl.copy(upstream);
downstream.modifiedColumnSet = downstreamColumnSet;
mcsTransformer.clearAndTransform(
upstream.modifiedColumnSet(), downstream.modifiedColumnSet);
WritableRowSet modifiedRows = null;
boolean dirtyModifiedColumnSet = false;
if (upstream.removed().isNonempty()) {
try (final RowSet prevRowSet = source.getRowSet().copyPrev();
final WritableRowSet dirtyRowSet = computeDirtyModifiedRowSetInPositionSpace(
prevRowSet, upstream.removed(), shift)) {
if (dirtyRowSet.isNonempty()) {
modifiedRows = prevRowSet.subSetForPositions(dirtyRowSet);
dirtyModifiedColumnSet = true;
// move the dirty rows into current keyspace
if (upstream.shifted().nonempty()) {
upstream.shifted().apply(modifiedRows);
}
}
}
}
final boolean haveAdds = upstream.added().isNonempty();
final boolean haveMods = upstream.modified().isNonempty()
&& upstream.modifiedColumnSet().containsAny(sourceColumnSet);
// we'll combine adds and mods to coalesce ranges prior to subSetForPositions
if (haveAdds || haveMods) {
try (final WritableRowSet dirtyFromAdds = haveAdds ? computeDirtyModifiedRowSetInPositionSpace(
source.getRowSet(), upstream.added(), shift) : null;
final WritableRowSet dirtyFromMods =
haveMods ? computeDirtyModifiedRowSetInPositionSpace(
source.getRowSet(), upstream.modified(), shift) : null) {
if (haveAdds && dirtyFromAdds.isNonempty()) {
dirtyModifiedColumnSet = true;
}
// note dirtyFromMods is propagated by the mcsTransformer
final RowSet dirtyPositions = haveAdds ? dirtyFromAdds : dirtyFromMods;
if (haveAdds && haveMods) {
dirtyFromAdds.insert(dirtyFromMods);
}
if (dirtyPositions.isNonempty()) {
final WritableRowSet dirtyRowSet =
source.getRowSet().subSetForPositions(dirtyPositions);
if (haveAdds && haveMods) {
// modifications might dirty added rows
dirtyRowSet.remove(upstream.added());
}
if (dirtyRowSet.isEmpty()) {
dirtyRowSet.close();
} else if (modifiedRows == null) {
modifiedRows = dirtyRowSet;
} else {
modifiedRows.insert(dirtyRowSet);
dirtyRowSet.close();
}
}
}
}
if (dirtyModifiedColumnSet) {
downstreamColumnSet.setAll(dirtyColumnSet);
}
if (modifiedRows != null) {
// close the copied upstream set
downstream.modified.close();
modifiedRows.insert(upstream.modified());
downstream.modified = modifiedRows;
} // else we can use the existing upstream modified row set
result.notifyListeners(downstream);
}
};
source.addUpdateListener(listener);
}
return result;
}
/**
* Computes the modified rowSet based on the sourceRowSet and the updatedRowSet. The provided rowSets must be in the
* same keyspace (previous, or current). The resulting rowSet is in position space and will not include any rows
* that are in the updatedRowSet.
*
* @param sourceRowSet the source's row set
* @param updatedRowSet the updated row set (removed, updated, or modified)
* @param shift the shift value
* @return the effective modified row set in position space of the same keyspace (previous, or current)
*/
private static WritableRowSet computeDirtyModifiedRowSetInPositionSpace(
@NotNull RowSet sourceRowSet, @NotNull RowSet updatedRowSet, long shift) {
final MutableLong minKeyAllowed = new MutableLong(0);
final RowSetBuilderSequential rowSetBuilder = RowSetFactory.builderSequential();
// when shift < 0, we need to look-ahead to avoid including rows that are part of the updatedRowSet
final MutableLong prevRangeEnd = new MutableLong(-1);
try (final WritableRowSet posRowSet = sourceRowSet.invert(updatedRowSet)) {
posRowSet.forAllRowKeyRanges((s, e) -> {
final long dirtyStart;
final long dirtyEnd;
if (shift > 0) {
dirtyStart = Math.max(minKeyAllowed.longValue(), s - shift);
dirtyEnd = s - 1;
minKeyAllowed.setValue(e + 1);
} else {
final long pEnd = prevRangeEnd.longValue();
prevRangeEnd.setValue(e);
if (pEnd == -1) {
return;
}
dirtyStart = pEnd + 1;
dirtyEnd = Math.min(s - 1, pEnd - shift);
}
if (dirtyStart <= dirtyEnd) {
rowSetBuilder.appendRange(dirtyStart, dirtyEnd);
}
});
}
// if we were looking ahead, we need to process the last range
final long pEnd = prevRangeEnd.longValue();
if (shift < 0 && pEnd != -1 && pEnd + 1 < sourceRowSet.size()) {
final long dirtyStart = pEnd + 1;
final long dirtyEnd = pEnd - shift;
rowSetBuilder.appendRange(dirtyStart, dirtyEnd);
}
return rowSetBuilder.build();
}
}
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