sunchao commented on a change in pull request #34611:
URL: https://github.com/apache/spark/pull/34611#discussion_r750731539
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
##########
@@ -179,6 +180,18 @@ public WritableColumnVector reserveDictionaryIds(int
capacity) {
*/
protected abstract void reserveInternal(int capacity);
+ /**
+ * Each byte of the returned value (long) has one bit from `bits`. I.e. it
is equivalent to
+ * byte[] a = {(byte)(bits >> 0 & 1), (byte)(bits >> 1 & 1),
+ * (byte)(bits >> 2 & 1), (byte)(bits >> 3 & 1),
+ * (byte)(bits >> 4 & 1), (byte)(bits >> 5 & 1),
+ * (byte)(bits >> 6 & 1), (byte)(bits >> 7 & 1)};
+ * return ByteBuffer.wrap(a).getLong();
+ */
+ protected final long toBitPerByte(int bits) {
+ return ((bits * 0x8040201008040201L) >>> 7) & 0x101010101010101L;
Review comment:
hm why we need a multiplication here? have you tried a loop with simple
shift and mask - wonder how much different it will be.
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
##########
@@ -201,6 +214,15 @@ public WritableColumnVector reserveDictionaryIds(int
capacity) {
*/
public abstract void putBooleans(int rowId, int count, boolean value);
+ /**
+ * Sets bits from [src[srcIndex], src[srcIndex + count]) to [rowId, rowId +
count)
+ * src must be positive and contain 8 bits of bitmask in the lowest byte.
+ */
+ public void putBooleans(int rowId, int count, int src, int srcIndex) {
+ putBytes(rowId, count,
ByteBuffer.allocate(8).putLong(toBitPerByte(src)).array(), srcIndex);
+ }
+ public void putBooleans(int rowId, int src) {putBooleans(rowId, 8, src, 0);}
Review comment:
nit: space
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
##########
@@ -201,6 +214,15 @@ public WritableColumnVector reserveDictionaryIds(int
capacity) {
*/
public abstract void putBooleans(int rowId, int count, boolean value);
+ /**
+ * Sets bits from [src[srcIndex], src[srcIndex + count]) to [rowId, rowId +
count)
+ * src must be positive and contain 8 bits of bitmask in the lowest byte.
+ */
+ public void putBooleans(int rowId, int count, int src, int srcIndex) {
Review comment:
why this takes a `int` for `src`, can we use `byte`?
##########
File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/benchmark/DataSourceReadBenchmark.scala
##########
@@ -541,6 +548,9 @@ object DataSourceReadBenchmark extends SqlBasedBenchmark {
}
override def runBenchmarkSuite(mainArgs: Array[String]): Unit = {
+ runBenchmark("SQL Single Boolean Column Scan") {
+ numericScanBenchmark(1024 * 1024 * 15, BooleanType)
Review comment:
I wonder if we can just add `BooleanType` to the benchmark below,
together with other types.
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
##########
@@ -201,6 +214,15 @@ public WritableColumnVector reserveDictionaryIds(int
capacity) {
*/
public abstract void putBooleans(int rowId, int count, boolean value);
+ /**
+ * Sets bits from [src[srcIndex], src[srcIndex + count]) to [rowId, rowId +
count)
+ * src must be positive and contain 8 bits of bitmask in the lowest byte.
+ */
+ public void putBooleans(int rowId, int count, int src, int srcIndex) {
+ putBytes(rowId, count,
ByteBuffer.allocate(8).putLong(toBitPerByte(src)).array(), srcIndex);
Review comment:
can we reuse the bytes here instead of allocating each time?
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java
##########
@@ -53,20 +53,45 @@ public void skip() {
throw new UnsupportedOperationException();
}
+ private void updateCurrentByte() {
+ try {
+ currentByte = in.read();
+ } catch (IOException e) {
+ throw new ParquetDecodingException("Failed to read a byte", e);
+ }
+ }
+
@Override
public final void readBooleans(int total, WritableColumnVector c, int rowId)
{
- // TODO: properly vectorize this
- for (int i = 0; i < total; i++) {
- c.putBoolean(rowId + i, readBoolean());
+ int i = 0;
+ if (bitOffset > 0) {
+ i = Math.min(8 - bitOffset, total);
+ c.putBooleans(rowId, i, currentByte, bitOffset);
+ bitOffset = (bitOffset + i) & 7;
Review comment:
can we just do `bitOffset = 0` here?
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