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distsql: base extraction for hash and merge join
pulls out common structure between the hashJoiner and mergeJoiner implementation, similar fashion to what was done with readerbase with respect to table reader and join reader.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright 2016 The Cockroach Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
| // implied. See the License for the specific language governing | ||
| // permissions and limitations under the License. | ||
| // | ||
| // Author: Irfan Sharif ([email protected]) | ||
|
|
||
| package distsql | ||
|
|
||
| import ( | ||
| "golang.org/x/net/context" | ||
|
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| "github.com/cockroachdb/cockroach/pkg/sql/parser" | ||
| "github.com/cockroachdb/cockroach/pkg/sql/sqlbase" | ||
| "github.com/cockroachdb/cockroach/pkg/util/log" | ||
| ) | ||
|
|
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| type joinerBase struct { | ||
| inputs []RowSource | ||
| output RowReceiver | ||
| ctx context.Context | ||
|
|
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| joinType joinType | ||
| outputCols columns | ||
| filter exprHelper | ||
| rowAlloc sqlbase.EncDatumRowAlloc | ||
| emptyLeft sqlbase.EncDatumRow | ||
| emptyRight sqlbase.EncDatumRow | ||
| combinedRow sqlbase.EncDatumRow | ||
| } | ||
|
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| // err := init(flowCtx, inputs, output, spec.OutputColumns, | ||
| // spec.Type, spec.LeftTypes, spec.RightTypes, spec.Expr) | ||
| func (jb *joinerBase) init( | ||
| flowCtx *FlowCtx, | ||
| inputs []RowSource, | ||
| output RowReceiver, | ||
| outputCols []uint32, | ||
| jType JoinType, | ||
| leftTypes []sqlbase.ColumnType_Kind, | ||
| rightTypes []sqlbase.ColumnType_Kind, | ||
| expr Expression, | ||
| ) error { | ||
| jb.inputs = inputs | ||
| jb.output = output | ||
| jb.ctx = log.WithLogTag(flowCtx.Context, "Joiner", nil) | ||
| jb.outputCols = columns(outputCols) | ||
| jb.joinType = joinType(jType) | ||
| jb.emptyLeft = make(sqlbase.EncDatumRow, len(leftTypes)) | ||
| for i := range jb.emptyLeft { | ||
| jb.emptyLeft[i].Datum = parser.DNull | ||
| } | ||
|
|
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| jb.emptyRight = make(sqlbase.EncDatumRow, len(rightTypes)) | ||
| for i := range jb.emptyRight { | ||
| jb.emptyRight[i].Datum = parser.DNull | ||
| } | ||
|
|
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| return jb.filter.init(expr, append(leftTypes, rightTypes...), flowCtx.evalCtx) | ||
| } | ||
|
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| // render evaluates the provided filter and constructs a row with columns from | ||
| // both rows as specified by the provided output columns. We expect left or | ||
| // right to be nil if there was no explicit "join" match, the filter is then | ||
| // evaluated on a combinedRow with null values for the columns of the nil row. | ||
| func (jb *joinerBase) render(lrow, rrow sqlbase.EncDatumRow) (sqlbase.EncDatumRow, error) { | ||
| switch jb.joinType { | ||
| case innerJoin: | ||
| if lrow == nil || rrow == nil { | ||
| return nil, nil | ||
| } | ||
| case fullOuter: | ||
| if lrow == nil { | ||
| lrow = jb.emptyLeft | ||
| } else if rrow == nil { | ||
| rrow = jb.emptyRight | ||
| } | ||
| case leftOuter: | ||
| if rrow == nil { | ||
| rrow = jb.emptyRight | ||
| } | ||
| case rightOuter: | ||
| if lrow == nil { | ||
| lrow = jb.emptyLeft | ||
| } | ||
| } | ||
| jb.combinedRow = append(jb.combinedRow[:0], lrow...) | ||
| jb.combinedRow = append(jb.combinedRow, rrow...) | ||
| res, err := jb.filter.evalFilter(jb.combinedRow) | ||
| if !res || err != nil { | ||
| return nil, err | ||
| } | ||
|
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| row := jb.rowAlloc.AllocRow(len(jb.outputCols)) | ||
| for i, col := range jb.outputCols { | ||
| row[i] = jb.combinedRow[col] | ||
| } | ||
| return row, nil | ||
| } |
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