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Indicate frontier init length in Lucene90BlockTreeTermsWriter#compileIndex. #13916

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Indicate frontier init length in Lucene90BlockTreeTermsWriter#compileIndex. #13916

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1 change: 1 addition & 0 deletions ...re/src/java/org/apache/lucene/codecs/lucene90/blocktree/Lucene90BlockTreeTermsWriter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -545,6 +545,7 @@ public void compileIndex(
.suffixRAMLimitMB(0d)
.dataOutput(getOnHeapReaderWriter(pageBits))
.setVersion(fstVersion)
.setInitLength(prefix.length + 1)
.build();
// if (DEBUG) {
// System.out.println(" compile index for prefix=" + prefix);
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14 changes: 11 additions & 3 deletions lucene/core/src/java/org/apache/lucene/util/fst/FSTCompiler.java
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Expand Up @@ -164,7 +164,8 @@ private FSTCompiler(
boolean allowFixedLengthArcs,
DataOutput dataOutput,
float directAddressingMaxOversizingFactor,
int version) {
int version,
int initLength) {
this.allowFixedLengthArcs = allowFixedLengthArcs;
this.directAddressingMaxOversizingFactor = directAddressingMaxOversizingFactor;
this.version = version;
Expand All @@ -185,7 +186,7 @@ private FSTCompiler(
NO_OUTPUT = outputs.getNoOutput();

@SuppressWarnings({"rawtypes", "unchecked"})
final UnCompiledNode<T>[] f = (UnCompiledNode<T>[]) new UnCompiledNode[10];
final UnCompiledNode<T>[] f = (UnCompiledNode<T>[]) new UnCompiledNode[initLength];
frontier = f;
for (int idx = 0; idx < frontier.length; idx++) {
frontier[idx] = new UnCompiledNode<>(this, idx);
Expand Down Expand Up @@ -247,6 +248,7 @@ public static class Builder<T> {
private DataOutput dataOutput;
private float directAddressingMaxOversizingFactor = DIRECT_ADDRESSING_MAX_OVERSIZING_FACTOR;
private int version = FST.VERSION_CURRENT;
private int initLength = 10;

/**
* @param inputType The input type (transition labels). Can be anything from {@link INPUT_TYPE}
Expand Down Expand Up @@ -346,6 +348,11 @@ public Builder<T> setVersion(int version) {
return this;
}

public Builder<T> setInitLength(int initLength) {
this.initLength = initLength;
return this;
}

/** Creates a new {@link FSTCompiler}. */
public FSTCompiler<T> build() {
// create a default DataOutput if not specified
Expand All @@ -359,7 +366,8 @@ public FSTCompiler<T> build() {
allowFixedLengthArcs,
dataOutput,
directAddressingMaxOversizingFactor,
version);
version,
initLength);
}
}

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