[MySql] Fix priority of additive and multiplicative operators (#3804)

Author: caicancai

sql/mysql/Positive-Technologies/MySqlParser.g4

@@ -2646,7 +2646,8 @@ expressionAtom
     | '(' selectStatement ')'                                       #subqueryExpressionAtom
     | INTERVAL expression intervalType                              #intervalExpressionAtom
     | left=expressionAtom bitOperator right=expressionAtom          #bitExpressionAtom
-    | left=expressionAtom mathOperator right=expressionAtom         #mathExpressionAtom
+    | left=expressionAtom multOperator right=expressionAtom         #mathExpressionAtom
+    | left=expressionAtom addOperator  right=expressionAtom         #mathExpressionAtom
     | left=expressionAtom jsonOperator right=expressionAtom         #jsonExpressionAtom
     ;
 
@@ -2667,8 +2668,12 @@ bitOperator
     : '<' '<' | '>' '>' | '&' | '^' | '|'
     ;
 
-mathOperator
-    : '*' | '/' | '%' | DIV | MOD | '+' | '-'
+multOperator
+    : '*' | '/' | '%' | DIV | MOD
+    ;
+
+addOperator
+    : '+' | '-'
     ;
 
 jsonOperator

sql/mysql/Positive-Technologies/examples/expressions.sql

@@ -0,0 +1,5 @@
+#begin
+select 1+2*3-4;
+select 1+9/3-2;
+select 2+9%2-1；
+#end

sql/mysql/Positive-Technologies/examples/expressions.sql.tree

@@ -0,0 +1 @@
+(root (sqlStatements (sqlStatement (dmlStatement (selectStatement (querySpecification select (selectElements (selectElement (expression (predicate (expressionAtom (expressionAtom (expressionAtom (constant (decimalLiteral 1))) (addOperator +) (expressionAtom (expressionAtom (constant (decimalLiteral 2))) (multOperator *) (expressionAtom (constant (decimalLiteral 3))))) (addOperator -) (expressionAtom (constant (decimalLiteral 4)))))))) fromClause)))) ; (sqlStatement (dmlStatement (selectStatement (querySpecification select (selectElements (selectElement (expression (predicate (expressionAtom (expressionAtom (expressionAtom (constant (decimalLiteral 1))) (addOperator +) (expressionAtom (expressionAtom (constant (decimalLiteral 9))) (multOperator /) (expressionAtom (constant (decimalLiteral 3))))) (addOperator -) (expressionAtom (constant (decimalLiteral 2)))))))) fromClause)))) ; (sqlStatement (dmlStatement (selectStatement (querySpecification select (selectElements (selectElement (expression (predicate (expressionAtom (expressionAtom (expressionAtom (constant (decimalLiteral 2))) (addOperator +) (expressionAtom (expressionAtom (constant (decimalLiteral 9))) (multOperator %) (expressionAtom (constant (decimalLiteral 2))))) (addOperator -) (expressionAtom (fullColumnName (uid (simpleId 1；))))))))) fromClause))))) <EOF>)