io.deephaven.server.table.stats.ChunkedNumericalStatsKernel Maven / Gradle / Ivy
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//
// Copyright (c) 2016-2024 Deephaven Data Labs and Patent Pending
//
package io.deephaven.server.table.stats;
import io.deephaven.engine.rowset.RowSet;
import io.deephaven.engine.table.ColumnSource;
import io.deephaven.engine.table.Table;
import io.deephaven.util.QueryConstants;
import java.math.BigDecimal;
import java.math.BigInteger;
public interface ChunkedNumericalStatsKernel extends ChunkedStatsKernel {
static ChunkedNumericalStatsKernel makeChunkedNumericalStats(final Class type) {
if (type == Byte.class || type == byte.class) {
return new ByteChunkedNumericalStats();
} else if (type == Short.class || type == short.class) {
return new ShortChunkedNumericalStats();
} else if (type == Integer.class || type == int.class) {
return new IntegerChunkedNumericalStats();
} else if (type == Long.class || type == long.class) {
return new LongChunkedNumericalStats();
} else if (type == Float.class || type == float.class) {
return new FloatChunkedNumericalStats();
} else if (type == Double.class || type == double.class) {
return new DoubleChunkedNumericalStats();
} else if (type == BigInteger.class) {
return new BigIntegerChunkedNumericalStats();
} else if (type == BigDecimal.class) {
return new BigDecimalChunkedNumericalStats();
} else {
throw new IllegalStateException(
"Invalid type for ChunkedNumericalStatsKernel: " + type.getCanonicalName());
}
}
default double avg(long count, double sumValue) {
if (count == 0) {
return QueryConstants.NULL_DOUBLE;
}
return sumValue / count;
}
default double stdDev(long count, double sum, double sumOfSquares) {
if (count <= 1) {
return QueryConstants.NULL_DOUBLE;
}
return Math.sqrt((sumOfSquares - sum * sum / count) / (count - 1));
}
}