sql parser support postgresql json operator

src/main/java/com/alibaba/druid/sql/ast/expr/SQLBinaryOperator.java

@@ -33,6 +33,11 @@ public enum SQLBinaryOperator {
     Add("+", 70), 
     Subtract("-", 70), 
     
+    SubGt("->", 20), 
+    SubGtGt("->>", 20), 
+    PoundGt("#>", 20), 
+    PoundGtGt("#>>", 20), 
+    
     LeftShift("<<", 80), 
     RightShift(">>", 80), 
 

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGLexer.java

@@ -165,7 +165,17 @@ public class PGLexer extends Lexer {
     }
     
     public void scanSharp() {
-        token = Token.POUND;
         scanChar();
+        if (ch == '>') {
+            scanChar();
+            if (ch == '>') {
+                scanChar();
+                token = Token.POUNDGTGT;
+            } else {
+                token = Token.POUNDGT;
+            }
+        } else {
+            token = Token.POUND;
+        }
     }
 }

src/main/java/com/alibaba/druid/sql/parser/Lexer.java

@@ -510,7 +510,17 @@ public class Lexer {
                 break;
             case '-':
                 scanChar();
-                token = Token.SUB;
+                if (ch == '>') {
+                    scanChar();
+                    if (ch == '>') {
+                        scanChar();
+                        token = Token.SUBGTGT;
+                    } else {
+                        token = Token.SUBGT;
+                    }
+                } else {
+                    token = Token.SUB;    
+                }
                 break;
             case '*':
                 scanChar();

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -152,11 +152,32 @@ public class SQLExprParser extends SQLParser {
     }
 
     public SQLExpr bitXorRest(SQLExpr expr) {
-        if (lexer.token() == Token.CARET) {
+        Token token = lexer.token;
+        if (token == Token.CARET) {
             lexer.nextToken();
             SQLExpr rightExp = primary();
             expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.BitwiseXor, rightExp, getDbType());
             expr = bitXorRest(expr);
+        } else if (token == Token.SUBGT) {
+            lexer.nextToken();
+            SQLExpr rightExp = primary();
+            expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.SubGt, rightExp, getDbType());
+            expr = bitXorRest(expr);
+        } else if (token == Token.SUBGTGT) {
+            lexer.nextToken();
+            SQLExpr rightExp = primary();
+            expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.SubGtGt, rightExp, getDbType());
+            expr = bitXorRest(expr);
+        } else if (token == Token.POUNDGT) {
+            lexer.nextToken();
+            SQLExpr rightExp = primary();
+            expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.PoundGt, rightExp, getDbType());
+            expr = bitXorRest(expr);
+        } else if (token == Token.POUNDGTGT) {
+            lexer.nextToken();
+            SQLExpr rightExp = primary();
+            expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.PoundGtGt, rightExp, getDbType());
+            expr = bitXorRest(expr);
         }
 
         return expr;

src/main/java/com/alibaba/druid/sql/parser/Token.java

@@ -315,6 +315,8 @@ public enum Token {
     BARSLASH("|/"), 
     PLUS("+"), 
     SUB("-"), 
+    SUBGT("->"), 
+    SUBGTGT("->>"), 
     STAR("*"), 
     SLASH("/"), 
     AMP("&"), 
@@ -324,7 +326,9 @@ public enum Token {
     LTLT("<<"), 
     GTGT(">>"),
     MONKEYS_AT("@"),
-    POUND("#")
+    POUND("#"),
+    POUNDGT("#>"),
+    POUNDGTGT("#>>")
     ;
 
     public final String name;