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c9b8bd8de2
Queue output items and reuse them. Remove the unneeded type system in sql and just use the Go type system. In best case this is more than an order of magnitude speedup: ``` BenchmarkSelectAll_1M-12 1 1841049400 ns/op 274299728 B/op 4198522 allocs/op BenchmarkSelectAll_1M-12 14 84833400 ns/op 169228346 B/op 3146541 allocs/op ```
113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package sql
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import (
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"fmt"
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"strings"
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)
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// String functions
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// String - returns the JSONPath representation
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func (e *JSONPath) String() string {
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if len(e.pathString) == 0 {
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parts := make([]string, len(e.PathExpr)+1)
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parts[0] = e.BaseKey.String()
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for i, pe := range e.PathExpr {
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parts[i+1] = pe.String()
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}
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e.pathString = strings.Join(parts, "")
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}
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return e.pathString
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}
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func (e *JSONPathElement) String() string {
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switch {
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case e.Key != nil:
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return e.Key.String()
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case e.Index != nil:
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return fmt.Sprintf("[%d]", *e.Index)
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case e.ObjectWildcard:
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return ".*"
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case e.ArrayWildcard:
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return "[*]"
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}
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return ""
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}
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// Removes double quotes in quoted identifiers
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func (i *Identifier) String() string {
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if i.Unquoted != nil {
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return *i.Unquoted
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}
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return string(*i.Quoted)
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}
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func (o *ObjectKey) String() string {
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if o.Lit != nil {
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return fmt.Sprintf("['%s']", string(*o.Lit))
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}
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return fmt.Sprintf(".%s", o.ID.String())
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}
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func (o *ObjectKey) keyString() string {
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if o.Lit != nil {
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return string(*o.Lit)
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}
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return o.ID.String()
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}
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// getLastKeypathComponent checks if the given expression is a path
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// expression, and if so extracts the last dot separated component of
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// the path. Otherwise it returns false.
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func getLastKeypathComponent(e *Expression) (string, bool) {
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if len(e.And) > 1 ||
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len(e.And[0].Condition) > 1 ||
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e.And[0].Condition[0].Not != nil ||
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e.And[0].Condition[0].Operand.ConditionRHS != nil {
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return "", false
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}
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operand := e.And[0].Condition[0].Operand.Operand
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if operand.Right != nil ||
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operand.Left.Right != nil ||
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operand.Left.Left.Negated != nil ||
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operand.Left.Left.Primary.JPathExpr == nil {
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return "", false
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}
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// Check if path expression ends in a key
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jpath := operand.Left.Left.Primary.JPathExpr
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n := len(jpath.PathExpr)
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if n > 0 && jpath.PathExpr[n-1].Key == nil {
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return "", false
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}
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ps := jpath.String()
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if idx := strings.LastIndex(ps, "."); idx >= 0 {
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// Get last part of path string.
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ps = ps[idx+1:]
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}
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return ps, true
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}
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// HasKeypath returns if the from clause has a key path -
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// e.g. S3object[*].id
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func (from *TableExpression) HasKeypath() bool {
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return len(from.Table.PathExpr) > 1
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}
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