*: support descending-order indexes (#2519)#68049

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takaidohigasi wants to merge 25 commits intopingcap:masterfrom

takaidohigasi:feature/desc-index

Commits on Apr 25, 2026

*: plumb per-column DESC flag through index metadata (phase 1 of #2519)

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planner: honor IndexColumn.Desc when matching sort property (phase 2 of #2519)

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codec: add EncodeKeyWithDesc/DecodeOneWithDesc primitives (phase 3a of #2519)

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tablecodec: encode DESC index columns with complemented bytes (phase 3b of #2519)

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distsql,executor,tables: wire DESC encoding through read paths (phase 3c of #2519)

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codec: auto-detect DESC flag bytes in chunk Decoder (phase 3d-A of #2519)

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planner,model: enforce IndexInfo.IsServable at plan time (#2519)

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ddl: gate CREATE INDEX on TiKV cluster version (#2519)

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planner: support mixed-direction composite indexes (#2519)

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ddl: regression test for DESC on expression-index parts (#2519)

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ddl: lock down sysvar create-time-only semantics for DESC indexes (#2519)

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ddl: clarify MinTiKVVersionForDescIndex is a release-coordinated TODO (#2519)
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ddl: reject DESC on the columns of a clustered PRIMARY KEY (#2519)
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executor: propagate IndexRangesToKVRangesWithDesc error in IndexMergeReader (#2519)
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planner: extend IsServable fence to LOAD DATA and IMPORT INTO (#2519)
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ddl: bake tidb_enable_descending_index decision at SQL frontend (#2519)
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ddl: delay DESC preflight until after OnExistIgnore short-circuit (#2519)
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ddl: bound PD GetAllStores call with a 5s timeout (#2519)
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ddl: accept pre-release TiKV at the DESC index version floor (#2519)
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committed

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*: support descending-order indexes (#2519)#68049

*: support descending-order indexes (#2519)#68049
takaidohigasi wants to merge 25 commits intopingcap:masterfrom
takaidohigasi:feature/desc-index

Commits on Apr 25, 2026

*: plumb per-column DESC flag through index metadata (phase 1 of #2519)

planner: honor IndexColumn.Desc when matching sort property (phase 2 of #2519)

codec: add EncodeKeyWithDesc/DecodeOneWithDesc primitives (phase 3a of #2519)

tablecodec: encode DESC index columns with complemented bytes (phase 3b of #2519)

distsql,executor,tables: wire DESC encoding through read paths (phase 3c of #2519)

codec: auto-detect DESC flag bytes in chunk Decoder (phase 3d-A of #2519)

planner,model: enforce IndexInfo.IsServable at plan time (#2519)

ddl: gate CREATE INDEX on TiKV cluster version (#2519)

planner: support mixed-direction composite indexes (#2519)

ddl: regression test for DESC on expression-index parts (#2519)

ddl: lock down sysvar create-time-only semantics for DESC indexes (#2519)

ddl: clarify MinTiKVVersionForDescIndex is a release-coordinated TODO (#2519)

ddl: reject DESC on the columns of a clustered PRIMARY KEY (#2519)

executor: propagate IndexRangesToKVRangesWithDesc error in IndexMergeReader (#2519)

planner: extend IsServable fence to LOAD DATA and IMPORT INTO (#2519)

ddl: bake tidb_enable_descending_index decision at SQL frontend (#2519)

ddl: delay DESC preflight until after OnExistIgnore short-circuit (#2519)

ddl: bound PD GetAllStores call with a 5s timeout (#2519)

ddl: accept pre-release TiKV at the DESC index version floor (#2519)

Commits on Apr 26, 2026

planner: extend IsServable fence to writable non-public indexes (#2519)

ddl: clarify checkTiKVSupportsDescIndex docstring (#2519)

ddl: assert idx_a presence in TestDescendingIndexSysvarIsCreateTimeOnly (#2519)

ddl: skip TiKV version gate for hypothetical DESC indexes (#2519)

planner: run IMPORT INTO servability fence on latest schema (#2519)

tests: add tiup-playground e2e smoke test for descending-order indexes (#2519)