stats: limit the length of sample values #7931
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alivxxx
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eurekaka
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Oct 18, 2018
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zz-jason
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Oct 22, 2018
zz-jason
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iamzhoug37
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Oct 25, 2018
bugfix fixed pingcap#7518 expression: MySQL compatible current_user function (pingcap#7801) plan: propagate constant over outer join (pingcap#7794) - extract `outerCol = const` from join conditions and filter conditions, substitute `outerCol` in join conditions with `const`; - extract `outerCol = innerCol` from join conditions, derive new join conditions based on this column equal condition and `outerCol` related expressions in join conditions and filter conditions; util/timeutil: fix data race caused by forgetting set stats lease to 0 (pingcap#7901) stats: handle ddl event for partition table (pingcap#7903) plan: implement Operand and Pattern of cascades planner. (pingcap#7910) planner: not convert to TableDual if empty range is derived from deferred constants (pingcap#7808) plan: move projEliminate behind aggEliminate (pingcap#7909) admin: fix admin check table bug of byte compare (pingcap#7887) * admin: remove reflect deepEqual stats: fix panic caused by empty histogram (pingcap#7912) plan: fix panic caused by empty schema of LogicalTableDual (pingcap#7906) * fix drop view if exist error (pingcap#7833) executor: refine `explain analyze` (pingcap#7888) executor: add an variable to compatible with MySQL insert for OGG (pingcap#7863) expression: maintain `DeferredExpr` in aggressive constant folding. (pingcap#7915) stats: fix histogram boundaries overflow error (pingcap#7883) ddl:support the definition of `null` change to `not null` using `alter table` (pingcap#7771) * ddl:support the definition of null change to not null using alter table ddl: add check when create table with foreign key. (pingcap#7885) * ddl: add check when create table with foreign key planner: eliminate if null on non null column (pingcap#7924) executor: fix a bug in point get (pingcap#7934) planner, executor: refine ColumnPrune for LogicalUnionAll (pingcap#7930) executor: fix panic when limit is too large (pingcap#7936) ddl: add TiDB version to metrics (pingcap#7902) stats: limit the length of sample values (pingcap#7931) vendor: update tipb (pingcap#7893) planner: support the Group and GroupExpr for the cascades planner (pingcap#7917) store/tikv: log more information when other err occurs (pingcap#7948) types: fix date time parse (pingcap#7933) ddl: just print error message when ddl job is normal to calcel, to eliminate noisy log (pingcap#7875) stats: update delta info for partition table (pingcap#7947) explaintest: add explain test for partition pruning (pingcap#7505) util: move disjoint set to util package (pingcap#7950) util: add PreAlloc4Row and Insert for Chunk and List (pingcap#7916) executor: add the slow log for commit (pingcap#7951) expression: add builtin json_keys (pingcap#7776) privilege: add USAGE in `show grants` for mysql compatibility (pingcap#7955) ddl: fix invailid ddl job panic (pingcap#7940) *: move ast.NewValueExpr to standalone parser_driver package (pingcap#7952) Make the ast package get rid of the dependency of types.Datum server: allow cors http request (pingcap#7939) *: move `Statement` and `RecordSet` from ast to sqlexec package (pingcap#7970) pr suggestion update executor/aggfuncs: split unit tests to corresponding file (pingcap#7993) store/tikv: fix typo (pingcap#7990) executor, planner: clone proj schema for different children in buildProj4Union (pingcap#7999) executor: let information_schema be the first database in ShowDatabases (pingcap#7938) stats: use local feedback for partition table (pingcap#7963) executor: add unit test for aggfuncs (pingcap#7966) server: add log for binary execute statement (pingcap#7987) admin: refine admin check decoder (pingcap#7862) executor: improve wide table insert & update performance (pingcap#7935) ddl: fix reassigned partition id in `truncate table` does not take effect (pingcap#7919) fix reassigned partition id in truncate table does not take effect add changelog for 2.1.0 rc4 (pingcap#8020) *: make parser package dependency as small as possible (pingcap#7989) parser: support `:=` in the `set` syntax (pingcap#8018) According to MySQL document, `set` use the = assignment operator, but the := assignment operator is also permitted stats: garbage collect stats for partition table (pingcap#7962) docs: add the proposal for the column pool (pingcap#7988) expression: refine built-in func truncate to support uint arg (pingcap#8000) stats: support show stats for partition table (pingcap#8023) stats: update error rate for partition table (pingcap#8022) stats: fix estimation for out of range point queries (pingcap#8015) *: move parser to a separate repository (pingcap#8036) executor: fix wrong result when index join on union scan. (pingcap#8031) Do not modify Plan of dataReaderBuilder directly, because it would impact next batch of outer rows, as well as other concurrent inner workers. Instead, build a local child builder to store the child plan. planner: fix a panic of a cached prepared statement with IndexScan (pingcap#8017) *: fix the issue of executing DDL after executing SQL failure in txn (pingcap#8044) * ddl, executor: fix the issue of executing DDL after executing SQL failure in txn add unit test remove debug info add like evaluator case sensitive test ddl, domain: make schema correct after canceling jobs (pingcap#7997) unit test fix code format proposal: maintaining histograms in plan. (pingcap#7605) support _tidb_rowid for table scan range (pingcap#8047) var rename fix
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What problem does this PR solve?
What is changed and how it works?
Since we store all the histogram buckets info in
mysql.stats_buckets, and thelower_boundandupper_boundcould only store at most 64k, so we need to limit the length of the collected samples, which will be used to build histograms. For index, we do not need to worry because their size is much smaller than the limit.For #7868.
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PTAL @zz-jason @winoros @eurekaka @lzmhhh123