*: add comment and fix lint tool (#7503)

expression/simple_rewriter.go

@@ -56,6 +56,8 @@ func RewriteSimpleExprWithTableInfo(ctx sessionctx.Context, tbl *model.TableInfo
 	return rewriter.pop(), nil
 }
 
+// ParseSimpleExprsWithSchema parses simple expression string to Expression.
+// The expression string must only reference the column in the given schema.
 func ParseSimpleExprsWithSchema(ctx sessionctx.Context, exprStr string, schema *Schema) ([]Expression, error) {
 	exprStr = "select " + exprStr
 	stmts, err := parser.New().Parse(exprStr, "", "")
@@ -74,6 +76,7 @@ func ParseSimpleExprsWithSchema(ctx sessionctx.Context, exprStr string, schema *
 	return exprs, nil
 }
 
+// RewriteSimpleExprWithSchema rewrites simple ast.ExprNode to expression.Expression.
 func RewriteSimpleExprWithSchema(ctx sessionctx.Context, expr ast.ExprNode, schema *Schema) (Expression, error) {
 	rewriter := &simpleRewriter{ctx: ctx, schema: schema}
 	expr.Accept(rewriter)

revive.toml

@@ -1,8 +1,8 @@
 ignoreGeneratedHeader = false
 severity = "error"
 confidence = 0.8
-errorCode = 0
-warningCode = 0
+errorCode = -1
+warningCode = -1
 
 [rule.blank-imports]
 [rule.context-as-argument]