Support Adaptive Lightweight Compression Algorithm

[Lloyd-Pottiger]

What problem does this PR solve?

Issue Number: close #8982

Problem Summary:

What is changed and how it works?

Support Adaptive Lightweight Compression Algorithm

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

PR needs rebase.

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[CalvinNeo]

lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-05-22 03:45:44.845025321 +0000 UTC m=+2229698.602160892: ☑️ agreed by CalvinNeo.
• 2024-07-08 03:14:26.300497354 +0000 UTC m=+240963.535731467: ☑️ agreed by JinheLin.

[JaySon-Huang]

/hold

[JaySon-Huang]

The check of source_size > sizeof(T) should be done before memcpy?

[Lloyd-Pottiger]

== here, fixed.

The following make sure source_size >= sizeof(T).

void CompressionCodecDeltaFOR::doDecompressData(
    const char * source,
    UInt32 source_size,
    char * dest,
    UInt32 uncompressed_size) const
{
    if (unlikely(source_size < 2))
        throw Exception(
            ErrorCodes::CANNOT_DECOMPRESS,
            "Cannot decompress DeltaFor-encoded data. File has wrong header");

[JaySon-Huang]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CalvinNeo, JaySon-Huang, JinheLin

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• OWNERS [CalvinNeo,JaySon-Huang,JinheLin]

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[JaySon-Huang]

/hold
cancel