Add a comment as suggested (#1721)

shendiaomo · web-flow · commit 8c6d30baadc3 · 2020-01-16T16:29:16.000+08:00
diff --git a/pkg/sql/codegen/attribute/attribute.go b/pkg/sql/codegen/attribute/attribute.go
@@ -167,6 +167,7 @@ func ExtractDocString(module ...string) {
 	if e != nil {
 		log.Println("ExtractDocString failed: ", e, string(output))
 	}
+	// json.Unmarshal extends the map rather than reallocate a new one, see golang.org/pkg/encoding/json/#Unmarshal
 	if e := json.Unmarshal(output, &PremadeModelParamsDocs); e != nil {
 		log.Println("ExtractDocString failed:", e, string(output))
 	}

Original file line number	Diff line number	Diff line change
`@@ -167,6 +167,7 @@ func ExtractDocString(module ...string) {`
`167`	`167`	`if e != nil {`
`168`	`168`	`log.Println("ExtractDocString failed: ", e, string(output))`
`169`	`169`	`}`
	`170`	`+ // json.Unmarshal extends the map rather than reallocate a new one, see golang.org/pkg/encoding/json/#Unmarshal`
`170`	`171`	`if e := json.Unmarshal(output, &PremadeModelParamsDocs); e != nil {`
`171`	`172`	`log.Println("ExtractDocString failed:", e, string(output))`
`172`	`173`	`}`