perf: preallocate slice with known length to optimize Mem Allocs

anazcodes · anazcodes · commit 8c1126822a7e · 2024-12-31T17:00:25.000+05:30
diff --git a/internal/compiler/query_catalog.go b/internal/compiler/query_catalog.go
@@ -86,7 +86,7 @@ func (qc QueryCatalog) GetTable(rel *ast.TableName) (*Table, error) {
 	if err != nil {
 		return nil, err
 	}
-	var cols []*Column
+	cols := make([]*Column, 0, len(src.Columns))
 	for _, c := range src.Columns {
 		cols = append(cols, ConvertColumn(rel, c))
 	}

Original file line number	Diff line number	Diff line change
`@@ -86,7 +86,7 @@ func (qc QueryCatalog) GetTable(rel ast.TableName) (Table, error) {`
`86`	`86`	`if err != nil {`
`87`	`87`	`return nil, err`
`88`	`88`	`}`
`89`		`- var cols []*Column`
	`89`	`+ cols := make([]*Column, 0, len(src.Columns))`
`90`	`90`	`for _, c := range src.Columns {`
`91`	`91`	`cols = append(cols, ConvertColumn(rel, c))`
`92`	`92`	`}`