exec: template out RANK and ROW_NUMBER

Templates out rankOp into two operators (for dense and non-dense
case) and templates out support for PARTITION BY clause for both
rankOp and rowNumberOp. The code is undertested and is lacking
benchmarks, but that will be addressed soon.

Release note: None

Makefile

@@ -755,7 +755,9 @@ EXECGEN_TARGETS = \
   pkg/sql/exec/selection_ops.eg.go \
   pkg/sql/exec/sort.eg.go \
   pkg/sql/exec/sum_agg.eg.go \
-  pkg/sql/exec/tuples_differ.eg.go
+  pkg/sql/exec/tuples_differ.eg.go \
+  pkg/sql/exec/vecbuiltins/rank.eg.go \
+  pkg/sql/exec/vecbuiltins/row_number.eg.go
 
 OPTGEN_TARGETS = \
 	pkg/sql/opt/memo/expr.og.go \
@@ -1411,6 +1413,8 @@ pkg/sql/exec/rowstovec.eg.go: pkg/sql/exec/rowstovec_tmpl.go
 pkg/sql/exec/sort.eg.go: pkg/sql/exec/sort_tmpl.go
 pkg/sql/exec/sum_agg.eg.go: pkg/sql/exec/sum_agg_tmpl.go
 pkg/sql/exec/tuples_differ.eg.go: pkg/sql/exec/tuples_differ_tmpl.go
+pkg/sql/exec/vecbuiltins/rank.eg.go: pkg/sql/exec/vecbuiltins/rank_tmpl.go
+pkg/sql/exec/vecbuiltins/row_number.eg.go: pkg/sql/exec/vecbuiltins/row_number_tmpl.go
 
 $(EXECGEN_TARGETS): bin/execgen
 	@# Remove generated files with the old suffix to avoid conflicts.

pkg/sql/exec/execgen/cmd/execgen/rank_gen.go

@@ -0,0 +1,91 @@
+// Copyright 2019 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.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"regexp"
+	"strings"
+	"text/template"
+)
+
+type rankTmplInfo struct {
+	Dense        bool
+	HasPartition bool
+}
+
+func (r rankTmplInfo) UpdateRank() string {
+	if r.Dense {
+		return fmt.Sprintf(
+			`r.rank++`,
+		)
+	}
+	return fmt.Sprintf(
+		`r.rank += r.rankIncrement
+r.rankIncrement = 1`,
+	)
+}
+
+func (r rankTmplInfo) UpdateRankIncrement() string {
+	if r.Dense {
+		return ``
+	}
+	return fmt.Sprintf(
+		`r.rankIncrement++`,
+	)
+}
+
+// Avoid unused warnings. These methods are used in the template.
+var (
+	_ = rankTmplInfo{}.UpdateRank()
+	_ = rankTmplInfo{}.UpdateRankIncrement()
+)
+
+func genRankOps(wr io.Writer) error {
+	d, err := ioutil.ReadFile("pkg/sql/exec/vecbuiltins/rank_tmpl.go")
+	if err != nil {
+		return err
+	}
+
+	s := string(d)
+
+	s = strings.Replace(s, "_DENSE", "{{.Dense}}", -1)
+	s = strings.Replace(s, "_PARTITION", "{{.HasPartition}}", -1)
+
+	updateRankRe := regexp.MustCompile(`_UPDATE_RANK\(\)`)
+	s = updateRankRe.ReplaceAllString(s, "{{.UpdateRank}}")
+	updateRankIncrementRe := regexp.MustCompile(`_UPDATE_RANK_INCREMENT\(\)`)
+	s = updateRankIncrementRe.ReplaceAllString(s, "{{.UpdateRankIncrement}}")
+
+	// Now, generate the op, from the template.
+	tmpl, err := template.New("rank_op").Funcs(template.FuncMap{"buildDict": buildDict}).Parse(s)
+	if err != nil {
+		return err
+	}
+
+	rankTmplInfos := []rankTmplInfo{
+		{Dense: false, HasPartition: false},
+		{Dense: false, HasPartition: true},
+		{Dense: true, HasPartition: false},
+		{Dense: true, HasPartition: true},
+	}
+	return tmpl.Execute(wr, rankTmplInfos)
+}
+
+func init() {
+	registerGenerator(genRankOps, "rank.eg.go")
+}

pkg/sql/exec/execgen/cmd/execgen/row_number_gen.go

@@ -0,0 +1,45 @@
+// Copyright 2019 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.
+
+package main
+
+import (
+	"io"
+	"io/ioutil"
+	"text/template"
+)
+
+func genRowNumberOp(wr io.Writer) error {
+	d, err := ioutil.ReadFile("pkg/sql/exec/vecbuiltins/row_number_tmpl.go")
+	if err != nil {
+		return err
+	}
+
+	s := string(d)
+
+	nextRowNumber := makeFunctionRegex("_NEXT_ROW_NUMBER", 1)
+	s = nextRowNumber.ReplaceAllString(s, `{{template "nextRowNumber" buildDict "Global" $ "HasPartition" $1 }}`)
+
+	// Now, generate the op, from the template.
+	tmpl, err := template.New("row_number_op").Funcs(template.FuncMap{"buildDict": buildDict}).Parse(s)
+	if err != nil {
+		return err
+	}
+
+	return tmpl.Execute(wr, struct{}{})
+}
+
+func init() {
+	registerGenerator(genRowNumberOp, "row_number.eg.go")
+}

pkg/sql/exec/vecbuiltins/.gitignore

@@ -0,0 +1,2 @@
+rank.eg.go
+row_number.eg.go