fix: corrected slow parsing of nested json (thanks @lvca), issue #10328

Author: tglman

core/src/main/grammar/OrientSQL.jjt

@@ -2171,6 +2171,9 @@ OExpression Expression():
 {Token token; }
 {
     (
+        LOOKAHEAD(1, {getToken(1).kind == LBRACE})
+        jjtThis.json = Json() {jjtThis.value = jjtThis.json; }
+        | 
         LOOKAHEAD( ArrayConcatExpression() )
         jjtThis.arrayConcatExpression = ArrayConcatExpression() { jjtThis.value = jjtThis.arrayConcatExpression; }
         |
@@ -2183,11 +2186,7 @@ OExpression Expression():
         LOOKAHEAD( Rid() )
         jjtThis.rid = Rid() { jjtThis.value = jjtThis.rid; }
         |
-        LOOKAHEAD( MathExpression() )
         jjtThis.mathExpression = MathExpression() { jjtThis.value = jjtThis.mathExpression; }
-        |
-        jjtThis.json = Json() {jjtThis.value = jjtThis.json; }
-
 	)
 	{ return jjtThis; }
 }
@@ -2214,6 +2213,9 @@ OArrayConcatExpressionElement ArrayConcatExpressionElement():
 {Token token; }
 {
     (
+        LOOKAHEAD(1, {getToken(1).kind == LBRACE})
+        jjtThis.json = Json() {jjtThis.value = jjtThis.json; }
+		| 
         <NULL> {jjtThis.isNull = true; jjtThis.value = null;}
         |
         <TRUE> { jjtThis.booleanValue = true; jjtThis.value = true; }
@@ -2223,10 +2225,7 @@ OArrayConcatExpressionElement ArrayConcatExpressionElement():
         LOOKAHEAD( Rid() )
         jjtThis.rid = Rid() { jjtThis.value = jjtThis.rid; }
         |
-        LOOKAHEAD( MathExpression() )
-        jjtThis.mathExpression = MathExpression() { jjtThis.value = jjtThis.mathExpression; }
-        |
-        jjtThis.json = Json() {jjtThis.value = jjtThis.json; }
+	    jjtThis.mathExpression = MathExpression() { jjtThis.value = jjtThis.mathExpression; }
 
 	)
 	{ return jjtThis; }