Module org.elasticsearch.compute

Package org.elasticsearch.compute.data.arrow

Class ArrowBufConstantDetection

java.lang.Object

org.elasticsearch.compute.data.arrow.ArrowBufConstantDetection

public final class ArrowBufConstantDetection
extends Object

Raw-buffer uniformity checks shared by *ArrowBufBlock.of() factories to detect constant-valued column batches before constructing a zero-copy block.

All checks short-circuit on the first differing value. Comparison is on raw buffer bits, which is correct for primitive equality and avoids NaN-equality pitfalls (different NaN bit patterns are correctly seen as different).

Method Summary

Modifier and Type	Method	Description
static boolean	isUniform(org.apache.arrow.memory.ArrowBuf buf, int rowCount, int byteSize)	Returns true when every byteSize-wide element in buf's first rowCount positions has identical bytes to position 0.
static boolean	isUniformBits(org.apache.arrow.memory.ArrowBuf buf, int bitCount)	Returns true when every bit in buf's first bitCount positions is identical.

Methods inherited from class java.lang.Object

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

Method Details

isUniform

public static boolean isUniform(org.apache.arrow.memory.ArrowBuf buf,
 int rowCount,
 int byteSize)

Returns true when every byteSize-wide element in buf's first rowCount positions has identical bytes to position 0. byteSize must be 1, 2, 4, or 8 (the fixed widths used by Arrow primitive vectors).

isUniformBits

public static boolean isUniformBits(org.apache.arrow.memory.ArrowBuf buf,
 int bitCount)

Returns true when every bit in buf's first bitCount positions is identical. Compares whole bytes against a uniform mask; the partial last byte (when bitCount % 8 != 0) is masked to ignore unused trailing bits.