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select.go
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select.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package esql
import (
"fmt"
"strings"
"github.com/xwb1989/sqlparser"
)
func (e *ESql) convertSelect(sel sqlparser.Select, domainID string, pagination ...interface{}) (dsl string, sortField []string, err error) {
if sel.Distinct != "" {
err := fmt.Errorf(`esql: SELECT DISTINCT not supported. use GROUP BY instead`)
return "", nil, err
}
var rootParent sqlparser.Expr
// a map that contains the main components of a query
dslMap := make(map[string]interface{})
// handle WHERE keyword
if sel.Where != nil {
dslQuery, err := e.convertWhereExpr(sel.Where.Expr, rootParent)
if err != nil {
return "", nil, err
}
dslMap["query"] = dslQuery
}
// cadence special handling: add domain ID query and time query bounds
if e.cadence {
e.addCadenceDomainTimeQuery(sel, domainID, dslMap)
}
// handle FROM keyword, currently only support 1 target table
if len(sel.From) != 1 {
if len(sel.From) == 0 {
err = fmt.Errorf("esql: invalid from expressino: no from expression specified")
} else {
err = fmt.Errorf("esql: join not supported")
}
return "", nil, err
}
// handle SELECT keyword
_, selectedColNameSlice, aggNameSlice, err := e.extractSelectedExpr(sel.SelectExprs)
if err != nil {
return "", nil, err
}
if len(selectedColNameSlice) > 0 {
colNames := `"` + strings.Join(selectedColNameSlice, `", "`) + `"`
dslMap["_source"] = fmt.Sprintf(`{"includes": [%v]}`, colNames)
}
// handle all aggregations, including GROUP BY, SELECT <agg function>, ORDER BY <agg function>, HAVING
dslAgg, err := e.convertAgg(sel)
if err != nil {
return "", nil, err
}
if dslAgg != "" || len(aggNameSlice) > 0 {
if dslAgg != "" {
dslMap["aggs"] = dslAgg
}
// do not return document contents if this is an aggregation query
dslMap["size"] = 0
} else {
// handle LIMIT and OFFSET keyword, these 2 keywords only works in non-aggregation query
dslMap["size"] = e.pageSize
if sel.Limit != nil {
if sel.Limit.Offset != nil {
dslMap["from"] = sqlparser.String(sel.Limit.Offset)
}
dslMap["size"] = sqlparser.String(sel.Limit.Rowcount)
}
// handle pagination
var searchAfterSlice []string
for _, v := range pagination {
switch v.(type) {
case int:
searchAfterSlice = append(searchAfterSlice, fmt.Sprintf(`%v`, v))
default:
searchAfterSlice = append(searchAfterSlice, fmt.Sprintf(`"%v"`, v))
}
}
if len(searchAfterSlice) > 0 {
searchAfterStr := strings.Join(searchAfterSlice, ",")
dslMap["search_after"] = fmt.Sprintf(`[%v]`, searchAfterStr)
}
}
// handle ORDER BY <column name>
// if it is an aggregate query, no point to order
if _, exist := dslMap["aggs"]; !exist && len(aggNameSlice) == 0 {
var orderBySlice []string
for _, orderExpr := range sel.OrderBy {
var colNameStr string
if colName, ok := orderExpr.Expr.(*sqlparser.ColName); ok {
colNameStr, err = e.convertColName(colName)
if err != nil {
return "", nil, err
}
} else {
err := fmt.Errorf(`esql: mix order by aggregations and column names`)
return "", nil, err
}
colNameStr = strings.Trim(colNameStr, "`")
orderByStr := fmt.Sprintf(`{"%v": "%v"}`, colNameStr, orderExpr.Direction)
orderBySlice = append(orderBySlice, orderByStr)
sortField = append(sortField, colNameStr)
}
// cadence special handling: add runID as sorting tie breaker
if e.cadence {
orderBySlice, sortField, err = e.addCadenceSort(orderBySlice, sortField)
if err != nil {
return "", nil, err
}
}
if len(orderBySlice) > 0 {
dslMap["sort"] = fmt.Sprintf("[%v]", strings.Join(orderBySlice, ","))
}
}
// generate the final json query
var dslQuerySlice []string
for tag, content := range dslMap {
dslQuerySlice = append(dslQuerySlice, fmt.Sprintf(`"%v": %v`, tag, content))
}
dsl = "{" + strings.Join(dslQuerySlice, ",") + "}"
return dsl, sortField, nil
}
func (e *ESql) convertWhereExpr(expr sqlparser.Expr, parent sqlparser.Expr) (string, error) {
var err error
if expr == nil {
err = fmt.Errorf("esql: invalid where expression, where expression should not be nil")
return "", err
}
switch expr.(type) {
case *sqlparser.ComparisonExpr:
return e.convertComparisionExpr(expr, parent, false)
case *sqlparser.AndExpr:
return e.convertAndExpr(expr, parent)
case *sqlparser.OrExpr:
return e.convertOrExpr(expr, parent)
case *sqlparser.ParenExpr:
return e.convertParenExpr(expr, parent)
case *sqlparser.NotExpr:
return e.convertNotExpr(expr, parent)
case *sqlparser.RangeCond:
return e.convertBetweenExpr(expr, parent, true, true, false)
case *sqlparser.IsExpr:
return e.convertIsExpr(expr, parent, false)
default:
err = fmt.Errorf(`esql: %T expression not supported in WHERE clause`, expr)
return "", err
}
}
func (e *ESql) convertBetweenExpr(expr sqlparser.Expr, parent sqlparser.Expr, fromInclusive bool, toInclusive bool, not bool) (string, error) {
rangeCond := expr.(*sqlparser.RangeCond)
lhs, ok := rangeCond.Left.(*sqlparser.ColName)
if !ok {
err := fmt.Errorf("esql: invalid range column name")
return "", err
}
lhsStr, err := e.convertColName(lhs)
if err != nil {
return "", err
}
fromStr := strings.Trim(sqlparser.String(rangeCond.From), `'`)
toStr := strings.Trim(sqlparser.String(rangeCond.To), `'`)
op := rangeCond.Operator
if not {
op = oppositeOperator[op]
}
gt := "gte"
lt := "lte"
if !fromInclusive {
gt = "gt"
}
if !toInclusive {
lt = "lt"
}
dsl := fmt.Sprintf(`{"range": {"%v": {"%v": "%v", "%v": "%v"}}}`, lhsStr, gt, fromStr, lt, toStr)
if op == sqlparser.NotBetweenStr {
dsl = fmt.Sprintf(`{"bool": {"must_not": [%v]}}`, dsl)
}
return dsl, nil
}
func (e *ESql) convertParenExpr(expr sqlparser.Expr, parent sqlparser.Expr) (string, error) {
exprInside := expr.(*sqlparser.ParenExpr).Expr
return e.convertWhereExpr(exprInside, expr)
}
// * dsl must_not is not an equivalent to sql NOT, should convert the inside expression accordingly
func (e *ESql) convertNotExpr(expr sqlparser.Expr, parent sqlparser.Expr) (string, error) {
notExpr := expr.(*sqlparser.NotExpr)
exprInside := notExpr.Expr
switch (exprInside).(type) {
case *sqlparser.NotExpr:
expr1 := exprInside.(*sqlparser.NotExpr)
expr2 := expr1.Expr
return e.convertWhereExpr(expr2, parent)
case *sqlparser.AndExpr:
expr1 := exprInside.(*sqlparser.AndExpr)
var exprLeft sqlparser.Expr = &sqlparser.NotExpr{Expr: expr1.Left}
var exprRight sqlparser.Expr = &sqlparser.NotExpr{Expr: expr1.Right}
var expr2 sqlparser.Expr = &sqlparser.OrExpr{Left: exprLeft, Right: exprRight}
return e.convertOrExpr(expr2, parent)
case *sqlparser.OrExpr:
expr1 := exprInside.(*sqlparser.OrExpr)
var exprLeft sqlparser.Expr = &sqlparser.NotExpr{Expr: expr1.Left}
var exprRight sqlparser.Expr = &sqlparser.NotExpr{Expr: expr1.Right}
var expr2 sqlparser.Expr = &sqlparser.AndExpr{Left: exprLeft, Right: exprRight}
return e.convertAndExpr(expr2, parent)
case *sqlparser.ParenExpr:
expr1 := exprInside.(*sqlparser.ParenExpr)
exprBody := expr1.Expr
var expr2 sqlparser.Expr = &sqlparser.NotExpr{Expr: exprBody}
return e.convertNotExpr(expr2, parent)
case *sqlparser.ComparisonExpr:
return e.convertComparisionExpr(exprInside, parent, true)
case *sqlparser.IsExpr:
return e.convertIsExpr(exprInside, parent, true)
case *sqlparser.RangeCond:
return e.convertBetweenExpr(exprInside, parent, true, true, true)
default:
err := fmt.Errorf("esql: %T expression not supported", exprInside)
return "", err
}
}
func (e *ESql) convertAndExpr(expr sqlparser.Expr, parent sqlparser.Expr) (string, error) {
andExpr := expr.(*sqlparser.AndExpr)
lhsExpr := andExpr.Left
rhsExpr := andExpr.Right
lhsStr, err := e.convertWhereExpr(lhsExpr, expr)
if err != nil {
return "", err
}
rhsStr, err := e.convertWhereExpr(rhsExpr, expr)
if err != nil {
return "", err
}
var dsl string
if lhsStr == "" || rhsStr == "" {
dsl = lhsStr + rhsStr
} else {
dsl = lhsStr + `,` + rhsStr
}
// merge chained AND expression
if _, ok := parent.(*sqlparser.AndExpr); ok {
return dsl, nil
}
return fmt.Sprintf(`{"bool": {"filter": [%v]}}`, dsl), nil
}
func (e *ESql) convertOrExpr(expr sqlparser.Expr, parent sqlparser.Expr) (string, error) {
orExpr := expr.(*sqlparser.OrExpr)
lhsExpr := orExpr.Left
rhsExpr := orExpr.Right
lhsStr, err := e.convertWhereExpr(lhsExpr, expr)
if err != nil {
return "", err
}
rhsStr, err := e.convertWhereExpr(rhsExpr, expr)
if err != nil {
return "", err
}
var dsl string
if lhsStr == "" || rhsStr == "" {
dsl = lhsStr + rhsStr
} else {
dsl = lhsStr + `,` + rhsStr
}
// merge chained OR expression
if _, ok := parent.(*sqlparser.OrExpr); ok {
return dsl, nil
}
return fmt.Sprintf(`{"bool": {"should": [%v]}}`, dsl), nil
}
func (e *ESql) convertIsExpr(expr sqlparser.Expr, parent sqlparser.Expr, not bool) (string, error) {
isExpr := expr.(*sqlparser.IsExpr)
lhs, ok := isExpr.Expr.(*sqlparser.ColName)
if !ok {
return "", fmt.Errorf("esql: is expression only support colname missing check")
}
lhsStr, err := e.convertColName(lhs)
if err != nil {
return "", err
}
dsl := ""
op := isExpr.Operator
if not {
if _, exist := oppositeOperator[op]; !exist {
err := fmt.Errorf("esql: is expression only support is null and is not null")
return "", err
}
op = oppositeOperator[op]
}
switch op {
case sqlparser.IsNullStr:
dsl = fmt.Sprintf(`{"bool": {"must_not": {"exists": {"field": "%v"}}}}`, lhsStr)
case sqlparser.IsNotNullStr:
dsl = fmt.Sprintf(`{"exists": {"field": "%v"}}`, lhsStr)
default:
return "", fmt.Errorf("esql: is expression only support is null and is not null")
}
return dsl, nil
}
func (e *ESql) convertComparisionExpr(expr sqlparser.Expr, parent sqlparser.Expr, not bool) (string, error) {
// extract lhs, and check lhs is a colName
var err error
scriptQuery := false
comparisonExpr := expr.(*sqlparser.ComparisonExpr)
lhsExpr, rhsExpr := comparisonExpr.Left, comparisonExpr.Right
var lhsStr, rhsStr, dsl string
// get operator
op := comparisonExpr.Operator
if not {
if _, exist := oppositeOperator[op]; !exist {
err := fmt.Errorf(`esql: %s operator not supported in comparison clause`, comparisonExpr.Operator)
return "", err
}
op = oppositeOperator[op]
}
if _, ok := lhsExpr.(*sqlparser.ColName); !ok {
scriptQuery = true
}
switch rhsExpr.(type) {
case *sqlparser.SQLVal, sqlparser.ValTuple:
rhsStr, err = e.convertValExpr(rhsExpr, false)
if err != nil {
return "", err
}
rhsStr, err = e.valueProcess(lhsStr, rhsStr)
if err != nil {
return "", err
}
default:
scriptQuery = true
}
// use painless scripting query here
if scriptQuery {
lhsStr, err = e.convertToScript(lhsExpr)
rhsStr, err = e.convertToScript(rhsExpr)
if err != nil {
return "", err
}
op, ok := op2PainlessOp[op]
if !ok {
err = fmt.Errorf("esql: not supported painless operator")
return "", err
}
script := fmt.Sprintf(`%v %v %v`, lhsStr, op, rhsStr)
dsl = fmt.Sprintf(`{"bool": {"filter": {"script": {"script": {"source": "%v"}}}}}`, script)
return dsl, nil
}
lhs := lhsExpr.(*sqlparser.ColName)
lhsStr, err = e.convertColName(lhs)
if err != nil {
return "", err
}
// generate dsl according to operator
switch op {
case "=":
dsl = fmt.Sprintf(`{"term": {"%v": "%v"}}`, lhsStr, rhsStr)
case "<":
dsl = fmt.Sprintf(`{"range": {"%v": {"lt": "%v"}}}`, lhsStr, rhsStr)
case "<=":
dsl = fmt.Sprintf(`{"range": {"%v": {"lte": "%v"}}}`, lhsStr, rhsStr)
case ">":
dsl = fmt.Sprintf(`{"range": {"%v": {"gt": "%v"}}}`, lhsStr, rhsStr)
case ">=":
dsl = fmt.Sprintf(`{"range": {"%v": {"gte": "%v"}}}`, lhsStr, rhsStr)
case "<>", "!=":
dsl = fmt.Sprintf(`{"bool": {"must_not": {"term": {"%v": "%v"}}}}`, lhsStr, rhsStr)
case "in":
rhsStr = strings.Replace(rhsStr, `'`, `"`, -1)
rhsStr = strings.Trim(rhsStr, "(")
rhsStr = strings.Trim(rhsStr, ")")
dsl = fmt.Sprintf(`{"terms": {"%v": [%v]}}`, lhsStr, rhsStr)
case "not in":
rhsStr = strings.Replace(rhsStr, `'`, `"`, -1)
rhsStr = strings.Trim(rhsStr, "(")
rhsStr = strings.Trim(rhsStr, ")")
dsl = fmt.Sprintf(`{"bool": {"must_not": {"terms": {"%v": [%v]}}}}`, lhsStr, rhsStr)
case "like":
rhsStr = strings.Replace(rhsStr, `_`, `?`, -1)
rhsStr = strings.Replace(rhsStr, `%`, `*`, -1)
dsl = fmt.Sprintf(`{"wildcard": {"%v": {"wildcard": "%v"}}}`, lhsStr, rhsStr)
case "not like":
rhsStr = strings.Replace(rhsStr, `_`, `?`, -1)
rhsStr = strings.Replace(rhsStr, `%`, `*`, -1)
dsl = fmt.Sprintf(`{"bool": {"must_not": {"wildcard": {"%v": {"wildcard": "%v"}}}}}`, lhsStr, rhsStr)
case "regexp":
dsl = fmt.Sprintf(`{"regexp": {"%v": "%v"}}`, lhsStr, rhsStr)
case "not regexp":
dsl = fmt.Sprintf(`{"bool": {"must_not": {"regexp": {"%v": "%v"}}}}`, lhsStr, rhsStr)
default:
err := fmt.Errorf(`esql: %s operator not supported in comparison clause`, comparisonExpr.Operator)
return "", err
}
return dsl, nil
}
func (e *ESql) convertValExpr(expr sqlparser.Expr, script bool) (dsl string, err error) {
switch expr.(type) {
case *sqlparser.SQLVal:
dsl = sqlparser.String(expr)
if !script {
dsl = strings.Trim(dsl, `'`)
}
// ValTuple is not a pointer from sqlparser
case sqlparser.ValTuple:
dsl = sqlparser.String(expr)
default:
err = fmt.Errorf("esql: not supported rhs expression %T", expr)
return "", err
}
return dsl, nil
}
func (e *ESql) convertColName(colName *sqlparser.ColName) (string, error) {
// here we garuantee colName is of type *ColName
colNameStr := sqlparser.String(colName)
replacedColNameStr, err := e.keyProcess(colNameStr)
if err != nil {
return "", err
}
replacedColNameStr = strings.Replace(replacedColNameStr, "`", "", -1)
return replacedColNameStr, nil
}
func (e *ESql) keyProcess(target string) (string, error) {
if e.filterKey != nil && e.filterKey(target) && e.processKey != nil {
target, err := e.processKey(target)
if err != nil {
return "", err
}
return target, nil
}
return target, nil
}
func (e *ESql) valueProcess(colName string, value string) (string, error) {
if e.filterValue != nil && e.filterValue(colName) && e.processValue != nil {
value, err := e.processValue(value)
if err != nil {
return "", err
}
return value, nil
}
return value, nil
}