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Tuple: add PreambleUtil documenting the serialized forms - #784
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Documents the compact (serial version 3 and legacy 1, 2) and updatable (QuickSelectSketch) layouts, the flags byte of each form, and the encodings of the example Summaries, in one place, following theta's PreambleUtil. Adds the byte-address and serial-version constants. No behavior change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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CompactTupleSketch and QuickSelectSketch now read and write the fixed preamble fields (preamble longs, serial version, family, sketch type, flags, seed hash, retained entries, theta, lgNom, lgCur, lgRF) at the PreambleUtil addresses, and use its serial-version constants instead of their own private copies. The optional, packed fields of the legacy compact form and of the updatable form still use a running offset, which starts at the address PreambleUtil documents. SerializerDeserializer's type-byte offset now refers to PreambleUtil.SKETCH_TYPE_BYTE. No change to the serialized bytes. The current and historical cross-language images still deserialize. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
proost
approved these changes
Oct 30, 2026
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Summary
The tuple package had no single place that documents its serialized forms. This PR adds
tuple/PreambleUtil.java, following the style oftheta/PreambleUtil. It documents:CompactTupleSketch, serial version 3 (current): the 1, 2 and 3 preamble-long cases. This form is binary compatible with C++ and Go.CompactTupleSketch, serial versions 1 and 2 (legacy, read only).QuickSelectSketch(updatable), serial version 2. This form is deprecated, has no seed hash, and only Java reads it.DoubleSummary,IntegerSummaryandArrayOfStringsSummary), which are specific to Java.It also adds constants for the byte addresses and serial versions. The ArrayOfDoubles layouts are documented in their own classes and are out of scope.
A second commit switches
CompactTupleSketchandQuickSelectSketchto the new constants, for the fixed preamble fields and the serial versions. The optional, packed fields of the legacy compact and updatable forms still use a running offset, starting at the addressPreambleUtildocuments.SerializerDeserializer.TYPE_BYTE_OFFSETnow refers toPreambleUtil.SKETCH_TYPE_BYTE.No behavior change: the serialized bytes are unchanged, and the current and historical (serial versions 1 and 2) cross-language images still deserialize.
Verification
mvn verifypasses (2302 tests), including javadoc and style checks.TupleCrossLanguageTestpasses for the Java, C++ and Go files and for the historical files.🤖 Generated with Claude Code