From d12e7e2cca56fcb42b39f07139308e99104b8abc Mon Sep 17 00:00:00 2001 From: Kenan Yao Date: Sun, 20 Jan 2019 02:21:52 +0800 Subject: [PATCH 1/5] plan: handle DNF expressions in `Selectivity` --- cmd/explaintest/r/explain_easy_stats.result | 7 +++++++ cmd/explaintest/s/explain_easy_stats_tbl_dnf.json | 1 + cmd/explaintest/t/explain_easy_stats.test | 5 +++++ planner/core/common_plans.go | 2 +- planner/core/exhaust_physical_plans.go | 2 +- planner/core/logical_plans.go | 2 +- statistics/selectivity.go | 9 +++++++-- util/ranger/detacher.go | 14 +++++++------- util/ranger/ranger_test.go | 4 ++-- 9 files changed, 32 insertions(+), 14 deletions(-) create mode 100644 cmd/explaintest/s/explain_easy_stats_tbl_dnf.json diff --git a/cmd/explaintest/r/explain_easy_stats.result b/cmd/explaintest/r/explain_easy_stats.result index 511f2dc5ff565..e25c9b6336b11 100644 --- a/cmd/explaintest/r/explain_easy_stats.result +++ b/cmd/explaintest/r/explain_easy_stats.result @@ -195,3 +195,10 @@ id count task operator info Point_Get_1 1.00 root table:index_prune, index:a b drop table if exists t1, t2, t3, index_prune; set @@session.tidb_opt_insubq_to_join_and_agg=1; +drop table if exists tbl; +create table tbl(column1 int, column2 int, index idx(column1, column2)); +load stats 's/explain_easy_stats_tbl_dnf.json'; +explain select * from tbl where (column1=0 and column2=1) or (column1=1 and column2=3) or (column1=2 and column2=5); +id count task operator info +IndexReader_9 3.00 root index:IndexScan_8 +└─IndexScan_8 3.00 cop table:tbl, index:column1, column2, range:[0 1,0 1], [1 3,1 3], [2 5,2 5], keep order:false diff --git a/cmd/explaintest/s/explain_easy_stats_tbl_dnf.json b/cmd/explaintest/s/explain_easy_stats_tbl_dnf.json new file mode 100644 index 0000000000000..df413c822f196 --- /dev/null +++ b/cmd/explaintest/s/explain_easy_stats_tbl_dnf.json @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/cmd/explaintest/t/explain_easy_stats.test b/cmd/explaintest/t/explain_easy_stats.test index fc9cee2f9c5bc..f175e5d0ec021 100644 --- a/cmd/explaintest/t/explain_easy_stats.test +++ b/cmd/explaintest/t/explain_easy_stats.test @@ -58,3 +58,8 @@ explain select * from index_prune WHERE a = 1010010404050976781 AND b = 26467085 drop table if exists t1, t2, t3, index_prune; set @@session.tidb_opt_insubq_to_join_and_agg=1; + +drop table if exists tbl; +create table tbl(column1 int, column2 int, index idx(column1, column2)); +load stats 's/explain_easy_stats_tbl_dnf.json'; +explain select * from tbl where (column1=0 and column2=1) or (column1=1 and column2=3) or (column1=2 and column2=5); diff --git a/planner/core/common_plans.go b/planner/core/common_plans.go index 37adc390b402c..719fe43c01932 100644 --- a/planner/core/common_plans.go +++ b/planner/core/common_plans.go @@ -294,7 +294,7 @@ func (e *Execute) buildRangeForIndexScan(sctx sessionctx.Context, is *PhysicalIn ranges := ranger.FullRange() if len(idxCols) > 0 { var err error - ranges, _, _, _, err = ranger.DetachCondAndBuildRangeForIndex(sctx, is.AccessCondition, idxCols, colLengths) + ranges, _, _, _, _, err = ranger.DetachCondAndBuildRangeForIndex(sctx, is.AccessCondition, idxCols, colLengths) if err != nil { return nil, errors.Trace(err) } diff --git a/planner/core/exhaust_physical_plans.go b/planner/core/exhaust_physical_plans.go index 0666277a2d867..7c720ff3911d4 100644 --- a/planner/core/exhaust_physical_plans.go +++ b/planner/core/exhaust_physical_plans.go @@ -529,7 +529,7 @@ func (p *LogicalJoin) buildRangeForIndexJoin(indexInfo *model.IndexInfo, innerPl // In `buildFakeEqCondsForIndexJoin`, we construct the equal conditions for join keys and remove filters that contain the join keys' column. // When t1.a = t2.a and t1.a > 1, we can also guarantee that t1.a > 1 won't be chosen as the access condition. // So the equal conditions we built can be successfully used to build a range if they can be used. They won't be affected by the existing filters. - ranges, accesses, moreRemained, _, err := ranger.DetachCondAndBuildRangeForIndex(p.ctx, access, idxCols, colLengths) + ranges, accesses, moreRemained, _, _, err := ranger.DetachCondAndBuildRangeForIndex(p.ctx, access, idxCols, colLengths) if err != nil { terror.Log(errors.Trace(err)) return nil, nil, nil diff --git a/planner/core/logical_plans.go b/planner/core/logical_plans.go index 7d433529bbdb3..13b00e98d5dd1 100644 --- a/planner/core/logical_plans.go +++ b/planner/core/logical_plans.go @@ -454,7 +454,7 @@ func (ds *DataSource) deriveIndexPathStats(path *accessPath) (bool, error) { path.countAfterAccess = float64(ds.statisticTable.Count) path.idxCols, path.idxColLens = expression.IndexInfo2Cols(ds.schema.Columns, path.index) if len(path.idxCols) != 0 { - path.ranges, path.accessConds, path.tableFilters, path.eqCondCount, err = ranger.DetachCondAndBuildRangeForIndex(ds.ctx, ds.pushedDownConds, path.idxCols, path.idxColLens) + path.ranges, path.accessConds, path.tableFilters, path.eqCondCount, _, err = ranger.DetachCondAndBuildRangeForIndex(ds.ctx, ds.pushedDownConds, path.idxCols, path.idxColLens) if err != nil { return false, errors.Trace(err) } diff --git a/statistics/selectivity.go b/statistics/selectivity.go index dad09f5adc2d4..a7edf426aeb9a 100644 --- a/statistics/selectivity.go +++ b/statistics/selectivity.go @@ -251,19 +251,24 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp func getMaskAndRanges(ctx sessionctx.Context, exprs []expression.Expression, rangeType ranger.RangeType, lengths []int, cols ...*expression.Column) (mask int64, ranges []*ranger.Range, err error) { sc := ctx.GetSessionVars().StmtCtx - var accessConds []expression.Expression + isDNF := false + var accessConds, filter []expression.Expression switch rangeType { case ranger.ColumnRangeType: accessConds = ranger.ExtractAccessConditionsForColumn(exprs, cols[0].UniqueID) ranges, err = ranger.BuildColumnRange(accessConds, sc, cols[0].RetType) case ranger.IndexRangeType: - ranges, accessConds, err = ranger.DetachSimpleCondAndBuildRangeForIndex(ctx, exprs, cols, lengths) + ranges, accessConds, filter, _, isDNF, err = ranger.DetachCondAndBuildRangeForIndex(ctx, exprs, cols, lengths) default: panic("should never be here") } if err != nil { return 0, nil, errors.Trace(err) } + if isDNF && len(filter) == 0 { + mask |= 1 + return mask, ranges, nil + } for i := range exprs { for j := range accessConds { if exprs[i].Equal(ctx, accessConds[j]) { diff --git a/util/ranger/detacher.go b/util/ranger/detacher.go index 0ab586b53eafe..a1d3b8b2e6360 100644 --- a/util/ranger/detacher.go +++ b/util/ranger/detacher.go @@ -298,10 +298,9 @@ func detachDNFCondAndBuildRangeForIndex(sctx sessionctx.Context, condition *expr } // DetachCondAndBuildRangeForIndex will detach the index filters from table filters. -// If the top layer is DNF, we return a int slice which is eqAndInCount of every DNF item. -// Otherwise just one number is returned. +// If the top layer is CNF, we return a int of eqAndInCount, otherwise we return 0. func DetachCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expression.Expression, cols []*expression.Column, - lengths []int) ([]*Range, []expression.Expression, []expression.Expression, int, error) { + lengths []int) (ranges []*Range, accesses, filters []expression.Expression, eqCount int, isDNF bool, err error) { newTpSlice := make([]*types.FieldType, 0, len(cols)) for _, col := range cols { newTpSlice = append(newTpSlice, newFieldType(col.RetType)) @@ -310,16 +309,17 @@ func DetachCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expre if sf, ok := conditions[0].(*expression.ScalarFunction); ok && sf.FuncName.L == ast.LogicOr { ranges, accesses, hasResidual, err := detachDNFCondAndBuildRangeForIndex(sctx, sf, cols, newTpSlice, lengths) if err != nil { - return nil, nil, nil, 0, errors.Trace(err) + return nil, nil, nil, 0, false, errors.Trace(err) } // If this DNF have something cannot be to calculate range, then all this DNF should be pushed as filter condition. if hasResidual { - return ranges, accesses, conditions, 0, nil + return ranges, accesses, conditions, 0, true, nil } - return ranges, accesses, nil, 0, nil + return ranges, accesses, nil, 0, true, nil } } - return detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, true) + ranges, accesses, filters, eqCount, err = detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, true) + return ranges, accesses, filters, eqCount, false, err } // DetachSimpleCondAndBuildRangeForIndex will detach the index filters from table filters. diff --git a/util/ranger/ranger_test.go b/util/ranger/ranger_test.go index e4505676d4076..724efacd8831f 100644 --- a/util/ranger/ranger_test.go +++ b/util/ranger/ranger_test.go @@ -594,7 +594,7 @@ func (s *testRangerSuite) TestIndexRange(c *C) { } cols, lengths := expression.IndexInfo2Cols(selection.Schema().Columns, tbl.Indices[tt.indexPos]) c.Assert(cols, NotNil) - ranges, conds, filter, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) + ranges, conds, filter, _, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) c.Assert(err, IsNil) c.Assert(fmt.Sprintf("%s", conds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) c.Assert(fmt.Sprintf("%s", filter), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) @@ -681,7 +681,7 @@ func (s *testRangerSuite) TestIndexRangeForUnsignedInt(c *C) { } cols, lengths := expression.IndexInfo2Cols(selection.Schema().Columns, tbl.Indices[tt.indexPos]) c.Assert(cols, NotNil) - ranges, conds, filter, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) + ranges, conds, filter, _, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) c.Assert(err, IsNil) c.Assert(fmt.Sprintf("%s", conds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) c.Assert(fmt.Sprintf("%s", filter), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) From 8f1595df450942ac62ffa3bfc58386db95ed82ed Mon Sep 17 00:00:00 2001 From: Kenan Yao Date: Sun, 20 Jan 2019 05:17:05 +0800 Subject: [PATCH 2/5] refactor --- planner/core/common_plans.go | 15 ++++--- planner/core/exhaust_physical_plans.go | 9 ++--- planner/core/logical_plans.go | 11 ++++-- statistics/selectivity.go | 10 +++-- util/ranger/detacher.go | 54 +++++++++++++++++++------- util/ranger/ranger_test.go | 16 ++++---- 6 files changed, 71 insertions(+), 44 deletions(-) diff --git a/planner/core/common_plans.go b/planner/core/common_plans.go index 719fe43c01932..e7d555ec132f7 100644 --- a/planner/core/common_plans.go +++ b/planner/core/common_plans.go @@ -291,15 +291,14 @@ func (e *Execute) rebuildRange(p Plan) error { func (e *Execute) buildRangeForIndexScan(sctx sessionctx.Context, is *PhysicalIndexScan) ([]*ranger.Range, error) { idxCols, colLengths := expression.IndexInfo2Cols(is.schema.Columns, is.Index) - ranges := ranger.FullRange() - if len(idxCols) > 0 { - var err error - ranges, _, _, _, _, err = ranger.DetachCondAndBuildRangeForIndex(sctx, is.AccessCondition, idxCols, colLengths) - if err != nil { - return nil, errors.Trace(err) - } + if len(idxCols) == 0 { + return ranger.FullRange(), nil + } + res, err := ranger.DetachCondAndBuildRangeForIndex(sctx, is.AccessCondition, idxCols, colLengths) + if err != nil { + return nil, err } - return ranges, nil + return res.Ranges, nil } // Deallocate represents deallocate plan. diff --git a/planner/core/exhaust_physical_plans.go b/planner/core/exhaust_physical_plans.go index 7c720ff3911d4..6518c635d1817 100644 --- a/planner/core/exhaust_physical_plans.go +++ b/planner/core/exhaust_physical_plans.go @@ -16,7 +16,6 @@ package core import ( "math" - "github.com/pingcap/errors" "github.com/pingcap/parser/ast" "github.com/pingcap/parser/model" "github.com/pingcap/parser/mysql" @@ -529,20 +528,20 @@ func (p *LogicalJoin) buildRangeForIndexJoin(indexInfo *model.IndexInfo, innerPl // In `buildFakeEqCondsForIndexJoin`, we construct the equal conditions for join keys and remove filters that contain the join keys' column. // When t1.a = t2.a and t1.a > 1, we can also guarantee that t1.a > 1 won't be chosen as the access condition. // So the equal conditions we built can be successfully used to build a range if they can be used. They won't be affected by the existing filters. - ranges, accesses, moreRemained, _, _, err := ranger.DetachCondAndBuildRangeForIndex(p.ctx, access, idxCols, colLengths) + res, err := ranger.DetachCondAndBuildRangeForIndex(p.ctx, access, idxCols, colLengths) if err != nil { - terror.Log(errors.Trace(err)) + terror.Log(err) return nil, nil, nil } // We should guarantee that all the join's equal condition is used. for _, eqCond := range eqConds { - if !expression.Contains(accesses, eqCond) { + if !expression.Contains(res.AccessConds, eqCond) { return nil, nil, nil } } - return ranges, append(remained, moreRemained...), keyOff2IdxOff + return res.Ranges, append(remained, res.RemainedConds...), keyOff2IdxOff } func (p *LogicalJoin) buildFakeEqCondsForIndexJoin(keys, idxCols []*expression.Column, colLengths []int, diff --git a/planner/core/logical_plans.go b/planner/core/logical_plans.go index 13b00e98d5dd1..8f24976a857c8 100644 --- a/planner/core/logical_plans.go +++ b/planner/core/logical_plans.go @@ -448,19 +448,22 @@ func (ds *DataSource) deriveTablePathStats(path *accessPath) (bool, error) { // And it will check whether this index is full matched by point query. We will use this check to // determine whether we remove other paths or not. func (ds *DataSource) deriveIndexPathStats(path *accessPath) (bool, error) { - var err error sc := ds.ctx.GetSessionVars().StmtCtx path.ranges = ranger.FullRange() path.countAfterAccess = float64(ds.statisticTable.Count) path.idxCols, path.idxColLens = expression.IndexInfo2Cols(ds.schema.Columns, path.index) if len(path.idxCols) != 0 { - path.ranges, path.accessConds, path.tableFilters, path.eqCondCount, _, err = ranger.DetachCondAndBuildRangeForIndex(ds.ctx, ds.pushedDownConds, path.idxCols, path.idxColLens) + res, err := ranger.DetachCondAndBuildRangeForIndex(ds.ctx, ds.pushedDownConds, path.idxCols, path.idxColLens) if err != nil { - return false, errors.Trace(err) + return false, err } + path.ranges = res.Ranges + path.accessConds = res.AccessConds + path.tableFilters = res.RemainedConds + path.eqCondCount = res.EqCondCount path.countAfterAccess, err = ds.stats.HistColl.GetRowCountByIndexRanges(sc, path.index.ID, path.ranges) if err != nil { - return false, errors.Trace(err) + return false, err } } else { path.tableFilters = ds.pushedDownConds diff --git a/statistics/selectivity.go b/statistics/selectivity.go index a7edf426aeb9a..bdc95a40252c4 100644 --- a/statistics/selectivity.go +++ b/statistics/selectivity.go @@ -252,20 +252,22 @@ func getMaskAndRanges(ctx sessionctx.Context, exprs []expression.Expression, ran lengths []int, cols ...*expression.Column) (mask int64, ranges []*ranger.Range, err error) { sc := ctx.GetSessionVars().StmtCtx isDNF := false - var accessConds, filter []expression.Expression + var accessConds, remainedConds []expression.Expression switch rangeType { case ranger.ColumnRangeType: accessConds = ranger.ExtractAccessConditionsForColumn(exprs, cols[0].UniqueID) ranges, err = ranger.BuildColumnRange(accessConds, sc, cols[0].RetType) case ranger.IndexRangeType: - ranges, accessConds, filter, _, isDNF, err = ranger.DetachCondAndBuildRangeForIndex(ctx, exprs, cols, lengths) + var res *ranger.DetachRangeResult + res, err = ranger.DetachCondAndBuildRangeForIndex(ctx, exprs, cols, lengths) + ranges, accessConds, remainedConds, isDNF = res.Ranges, res.AccessConds, res.RemainedConds, res.IsDNFCond default: panic("should never be here") } if err != nil { - return 0, nil, errors.Trace(err) + return 0, nil, err } - if isDNF && len(filter) == 0 { + if isDNF && len(remainedConds) == 0 { mask |= 1 return mask, ranges, nil } diff --git a/util/ranger/detacher.go b/util/ranger/detacher.go index a1d3b8b2e6360..7ddbca856f7eb 100644 --- a/util/ranger/detacher.go +++ b/util/ranger/detacher.go @@ -138,16 +138,17 @@ func getEqOrInColOffset(expr expression.Expression, cols []*expression.Column) i // It will first find the point query column and then extract the range query column. // considerDNF is true means it will try to extract access conditions from the DNF expressions. func detachCNFCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expression.Expression, cols []*expression.Column, - tpSlice []*types.FieldType, lengths []int, considerDNF bool) ([]*Range, []expression.Expression, []expression.Expression, int, error) { + tpSlice []*types.FieldType, lengths []int, considerDNF bool) (*DetachRangeResult, error) { var ( eqCount int ranges []*Range err error ) + res := &DetachRangeResult{} accessConds, filterConds, newConditions, emptyRange := extractEqAndInCondition(sctx, conditions, cols, lengths) if emptyRange { - return ranges, nil, nil, 0, nil + return res, nil } for ; eqCount < len(accessConds); eqCount++ { @@ -163,9 +164,13 @@ func detachCNFCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []ex filterConds = append(filterConds, newConditions...) ranges, err = buildCNFIndexRange(sctx.GetSessionVars().StmtCtx, cols, tpSlice, lengths, eqOrInCount, accessConds) if err != nil { - return nil, nil, nil, 0, errors.Trace(err) + return res, err } - return ranges, accessConds, filterConds, eqCount, nil + res.Ranges = ranges + res.AccessConds = accessConds + res.RemainedConds = filterConds + res.EqCondCount = eqCount + return res, nil } checker := &conditionChecker{ colUniqueID: cols[eqOrInCount].UniqueID, @@ -186,7 +191,11 @@ func detachCNFCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []ex } } ranges, err = buildCNFIndexRange(sctx.GetSessionVars().StmtCtx, cols, tpSlice, lengths, eqOrInCount, accessConds) - return ranges, accessConds, filterConds, eqCount, errors.Trace(err) + res.Ranges = ranges + res.AccessConds = accessConds + res.RemainedConds = filterConds + res.EqCondCount = eqCount + return res, err } func extractEqAndInCondition(sctx sessionctx.Context, conditions []expression.Expression, @@ -260,10 +269,13 @@ func detachDNFCondAndBuildRangeForIndex(sctx sessionctx.Context, condition *expr if sf, ok := item.(*expression.ScalarFunction); ok && sf.FuncName.L == ast.LogicAnd { cnfItems := expression.FlattenCNFConditions(sf) var accesses, filters []expression.Expression - ranges, accesses, filters, _, err := detachCNFCondAndBuildRangeForIndex(sctx, cnfItems, cols, newTpSlice, lengths, true) + res, err := detachCNFCondAndBuildRangeForIndex(sctx, cnfItems, cols, newTpSlice, lengths, true) if err != nil { return nil, nil, false, nil } + ranges := res.Ranges + accesses = res.AccessConds + filters = res.RemainedConds if len(accesses) == 0 { return FullRange(), nil, true, nil } @@ -297,10 +309,19 @@ func detachDNFCondAndBuildRangeForIndex(sctx sessionctx.Context, condition *expr return totalRanges, []expression.Expression{expression.ComposeDNFCondition(sctx, newAccessItems...)}, hasResidual, nil } +type DetachRangeResult struct { + Ranges []*Range + AccessConds []expression.Expression + RemainedConds []expression.Expression + EqCondCount int + IsDNFCond bool +} + // DetachCondAndBuildRangeForIndex will detach the index filters from table filters. // If the top layer is CNF, we return a int of eqAndInCount, otherwise we return 0. func DetachCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expression.Expression, cols []*expression.Column, - lengths []int) (ranges []*Range, accesses, filters []expression.Expression, eqCount int, isDNF bool, err error) { + lengths []int) (*DetachRangeResult, error) { + res := &DetachRangeResult{} newTpSlice := make([]*types.FieldType, 0, len(cols)) for _, col := range cols { newTpSlice = append(newTpSlice, newFieldType(col.RetType)) @@ -309,29 +330,32 @@ func DetachCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expre if sf, ok := conditions[0].(*expression.ScalarFunction); ok && sf.FuncName.L == ast.LogicOr { ranges, accesses, hasResidual, err := detachDNFCondAndBuildRangeForIndex(sctx, sf, cols, newTpSlice, lengths) if err != nil { - return nil, nil, nil, 0, false, errors.Trace(err) + return res, errors.Trace(err) } + res.Ranges = ranges + res.AccessConds = accesses + res.IsDNFCond = true // If this DNF have something cannot be to calculate range, then all this DNF should be pushed as filter condition. if hasResidual { - return ranges, accesses, conditions, 0, true, nil + res.RemainedConds = conditions + return res, nil } - return ranges, accesses, nil, 0, true, nil + return res, nil } } - ranges, accesses, filters, eqCount, err = detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, true) - return ranges, accesses, filters, eqCount, false, err + return detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, true) } // DetachSimpleCondAndBuildRangeForIndex will detach the index filters from table filters. // It will find the point query column firstly and then extract the range query column. func DetachSimpleCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expression.Expression, - cols []*expression.Column, lengths []int) (ranges []*Range, accessConds []expression.Expression, err error) { + cols []*expression.Column, lengths []int) ([]*Range, []expression.Expression, error) { newTpSlice := make([]*types.FieldType, 0, len(cols)) for _, col := range cols { newTpSlice = append(newTpSlice, newFieldType(col.RetType)) } - ranges, accessConds, _, _, err = detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, false) - return ranges, accessConds, errors.Trace(err) + res, err := detachCNFCondAndBuildRangeForIndex(sctx, conditions, cols, newTpSlice, lengths, false) + return res.Ranges, res.AccessConds, err } func removeAccessConditions(conditions, accessConds []expression.Expression) []expression.Expression { diff --git a/util/ranger/ranger_test.go b/util/ranger/ranger_test.go index 724efacd8831f..79c29b0b68866 100644 --- a/util/ranger/ranger_test.go +++ b/util/ranger/ranger_test.go @@ -594,11 +594,11 @@ func (s *testRangerSuite) TestIndexRange(c *C) { } cols, lengths := expression.IndexInfo2Cols(selection.Schema().Columns, tbl.Indices[tt.indexPos]) c.Assert(cols, NotNil) - ranges, conds, filter, _, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) + res, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) c.Assert(err, IsNil) - c.Assert(fmt.Sprintf("%s", conds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) - c.Assert(fmt.Sprintf("%s", filter), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) - got := fmt.Sprintf("%v", ranges) + c.Assert(fmt.Sprintf("%s", res.AccessConds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) + c.Assert(fmt.Sprintf("%s", res.RemainedConds), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) + got := fmt.Sprintf("%v", res.Ranges) c.Assert(got, Equals, tt.resultStr, Commentf("different for expr %s", tt.exprStr)) } } @@ -681,11 +681,11 @@ func (s *testRangerSuite) TestIndexRangeForUnsignedInt(c *C) { } cols, lengths := expression.IndexInfo2Cols(selection.Schema().Columns, tbl.Indices[tt.indexPos]) c.Assert(cols, NotNil) - ranges, conds, filter, _, _, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) + res, err := ranger.DetachCondAndBuildRangeForIndex(ctx, conds, cols, lengths) c.Assert(err, IsNil) - c.Assert(fmt.Sprintf("%s", conds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) - c.Assert(fmt.Sprintf("%s", filter), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) - got := fmt.Sprintf("%v", ranges) + c.Assert(fmt.Sprintf("%s", res.AccessConds), Equals, tt.accessConds, Commentf("wrong access conditions for expr: %s", tt.exprStr)) + c.Assert(fmt.Sprintf("%s", res.RemainedConds), Equals, tt.filterConds, Commentf("wrong filter conditions for expr: %s", tt.exprStr)) + got := fmt.Sprintf("%v", res.Ranges) c.Assert(got, Equals, tt.resultStr, Commentf("different for expr %s", tt.exprStr)) } } From d1aee37101b4c31e4066e057041491a356c4b4bc Mon Sep 17 00:00:00 2001 From: Kenan Yao Date: Sun, 20 Jan 2019 05:31:56 +0800 Subject: [PATCH 3/5] add comments --- util/ranger/detacher.go | 1 + 1 file changed, 1 insertion(+) diff --git a/util/ranger/detacher.go b/util/ranger/detacher.go index 7ddbca856f7eb..d2e2d76c4faab 100644 --- a/util/ranger/detacher.go +++ b/util/ranger/detacher.go @@ -309,6 +309,7 @@ func detachDNFCondAndBuildRangeForIndex(sctx sessionctx.Context, condition *expr return totalRanges, []expression.Expression{expression.ComposeDNFCondition(sctx, newAccessItems...)}, hasResidual, nil } +// DetachRangeResult wraps up results when detaching conditions and builing ranges. type DetachRangeResult struct { Ranges []*Range AccessConds []expression.Expression From 516eb9d2ebe6d245a99d9131038fc244282893c9 Mon Sep 17 00:00:00 2001 From: Kenan Yao Date: Sun, 20 Jan 2019 06:56:07 +0800 Subject: [PATCH 4/5] handle remained conds --- statistics/selectivity.go | 22 ++++++++++++++-------- util/ranger/detacher.go | 15 ++++++++++----- 2 files changed, 24 insertions(+), 13 deletions(-) diff --git a/statistics/selectivity.go b/statistics/selectivity.go index bdc95a40252c4..d72ad698fe1ec 100644 --- a/statistics/selectivity.go +++ b/statistics/selectivity.go @@ -39,6 +39,9 @@ type StatsNode struct { Selectivity float64 // numCols is the number of columns contained in the index or column(which is always 1). numCols int + // partCover indicates whether the bit in the mask is for a full cover or partial cover. It is only true + // when the condition is a DNF expression on index, and the expression is not totally extracted as access condition. + partCover bool } // The type of the StatsNode. @@ -142,7 +145,6 @@ func isColEqCorCol(filter expression.Expression) *expression.Column { // Selectivity is a function calculate the selectivity of the expressions. // The definition of selectivity is (row count after filter / row count before filter). // And exprs must be CNF now, in other words, `exprs[0] and exprs[1] and ... and exprs[len - 1]` should be held when you call this. -// TODO: support expressions that the top layer is a DNF. // Currently the time complexity is o(n^2). func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Expression) (float64, []*StatsNode, error) { // If table's count is zero or conditions are empty, we should return 100% selectivity. @@ -186,7 +188,7 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp for id, colInfo := range coll.Columns { col := expression.ColInfo2Col(extractedCols, colInfo.Info) if col != nil { - maskCovered, ranges, err := getMaskAndRanges(ctx, remainedExprs, ranger.ColumnRangeType, nil, col) + maskCovered, ranges, _, err := getMaskAndRanges(ctx, remainedExprs, ranger.ColumnRangeType, nil, col) if err != nil { return 0, nil, errors.Trace(err) } @@ -215,7 +217,7 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp for i := 0; i < len(idxCols); i++ { lengths = append(lengths, idxInfo.Info.Columns[i].Length) } - maskCovered, ranges, err := getMaskAndRanges(ctx, remainedExprs, ranger.IndexRangeType, lengths, idxCols...) + maskCovered, ranges, partCover, err := getMaskAndRanges(ctx, remainedExprs, ranger.IndexRangeType, lengths, idxCols...) if err != nil { return 0, nil, errors.Trace(err) } @@ -231,6 +233,7 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp Ranges: ranges, numCols: len(idxInfo.Info.Columns), Selectivity: selectivity, + partCover: partCover, }) } } @@ -240,6 +243,9 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp for _, set := range usedSets { mask &^= set.mask ret *= set.Selectivity + if set.partCover { + ret *= selectionFactor + } } // If there's still conditions which cannot be calculated, we will multiply a selectionFactor. if mask > 0 { @@ -249,7 +255,7 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp } func getMaskAndRanges(ctx sessionctx.Context, exprs []expression.Expression, rangeType ranger.RangeType, - lengths []int, cols ...*expression.Column) (mask int64, ranges []*ranger.Range, err error) { + lengths []int, cols ...*expression.Column) (mask int64, ranges []*ranger.Range, partCover bool, err error) { sc := ctx.GetSessionVars().StmtCtx isDNF := false var accessConds, remainedConds []expression.Expression @@ -265,11 +271,11 @@ func getMaskAndRanges(ctx sessionctx.Context, exprs []expression.Expression, ran panic("should never be here") } if err != nil { - return 0, nil, err + return 0, nil, false, err } - if isDNF && len(remainedConds) == 0 { + if isDNF && len(accessConds) > 0 { mask |= 1 - return mask, ranges, nil + return mask, ranges, len(remainedConds) > 0, nil } for i := range exprs { for j := range accessConds { @@ -279,7 +285,7 @@ func getMaskAndRanges(ctx sessionctx.Context, exprs []expression.Expression, ran } } } - return mask, ranges, nil + return mask, ranges, false, nil } // getUsableSetsByGreedy will select the indices and pk used for calculate selectivity by greedy algorithm. diff --git a/util/ranger/detacher.go b/util/ranger/detacher.go index d2e2d76c4faab..774942cc7b573 100644 --- a/util/ranger/detacher.go +++ b/util/ranger/detacher.go @@ -311,15 +311,20 @@ func detachDNFCondAndBuildRangeForIndex(sctx sessionctx.Context, condition *expr // DetachRangeResult wraps up results when detaching conditions and builing ranges. type DetachRangeResult struct { - Ranges []*Range - AccessConds []expression.Expression + // Ranges is the ranges extracted and built from conditions. + Ranges []*Range + // AccessConds is the extracted conditions for access. + AccessConds []expression.Expression + // RemainedConds is the filter conditions which should be kept after access. RemainedConds []expression.Expression - EqCondCount int - IsDNFCond bool + // EqCondCount is the number of equal conditions extracted. + EqCondCount int + // IsDNFCond indicates if the top layer of conditions are in DNF. + IsDNFCond bool } // DetachCondAndBuildRangeForIndex will detach the index filters from table filters. -// If the top layer is CNF, we return a int of eqAndInCount, otherwise we return 0. +// The returned values are encapsulated into a struct DetachRangeResult, see its comments for explanation. func DetachCondAndBuildRangeForIndex(sctx sessionctx.Context, conditions []expression.Expression, cols []*expression.Column, lengths []int) (*DetachRangeResult, error) { res := &DetachRangeResult{} From 09ae23137028eb4aa885ae9842ba8f499b6d0b54 Mon Sep 17 00:00:00 2001 From: Kenan Yao Date: Sun, 20 Jan 2019 11:00:05 +0800 Subject: [PATCH 5/5] add comment for partCover --- statistics/selectivity.go | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/statistics/selectivity.go b/statistics/selectivity.go index d72ad698fe1ec..f4135bd3d4a93 100644 --- a/statistics/selectivity.go +++ b/statistics/selectivity.go @@ -243,6 +243,10 @@ func (coll *HistColl) Selectivity(ctx sessionctx.Context, exprs []expression.Exp for _, set := range usedSets { mask &^= set.mask ret *= set.Selectivity + // If `partCover` is true, it means that the conditions are in DNF form, and only part + // of the DNF expressions are extracted as access conditions, so besides from the selectivity + // of the extracted access conditions, we multiply another selectionFactor for the residual + // conditions. if set.partCover { ret *= selectionFactor }