[chore] Started to add oracle JSON_TABLE features

Author: ANeumann82

src/main/java/net/sf/jsqlparser/expression/JsonFunction.java

@@ -27,7 +27,7 @@
  */
 public class JsonFunction extends ASTNodeAccessImpl implements Expression {
     public enum JsonOnResponseBehaviorType {
-        ERROR, NULL, DEFAULT, EMPTY_ARRAY, EMPTY_OBJECT, TRUE, FALSE, UNKNOWN
+        ERROR, NULL, DEFAULT, EMPTY, EMPTY_ARRAY, EMPTY_OBJECT, TRUE, FALSE, UNKNOWN
     }
 
     public enum JsonWrapperType {
@@ -42,6 +42,10 @@ public enum JsonQuotesType {
         KEEP, OMIT
     }
 
+    public enum ScalarsType {
+        ALLOW, DISALLOW
+    }
+
     public static class JsonOnResponseBehavior {
         private JsonOnResponseBehaviorType type;
         private Expression expression;
@@ -82,6 +86,9 @@ public StringBuilder append(StringBuilder builder) {
                 case DEFAULT:
                     builder.append("DEFAULT ").append(expression);
                     break;
+                case EMPTY:
+                    builder.append("EMPTY ");
+                    break;
                 case EMPTY_ARRAY:
                     builder.append("EMPTY ARRAY");
                     break;
@@ -98,6 +105,7 @@ public StringBuilder append(StringBuilder builder) {
                     builder.append("UNKNOWN");
                     break;
                 default:
+                    throw new IllegalStateException("Unhandled JsonOnResponseBehavior: " + type );
                     // this should never happen
             }
             return builder;
@@ -130,6 +138,7 @@ public String toString() {
     private boolean wrapperArray;
     private JsonQuotesType quotesType;
     private boolean quotesOnScalarString;
+    private ScalarsType scalarsType;
 
     public JsonFunction() {}
 
@@ -294,6 +303,14 @@ public void setQuotesOnScalarString(boolean quotesOnScalarString) {
         this.quotesOnScalarString = quotesOnScalarString;
     }
 
+    public ScalarsType getScalarsType() {
+        return scalarsType;
+    }
+
+    public void setScalarsType(ScalarsType type) {
+        this.scalarsType = type;
+    }
+
     public boolean isEmpty() {
         return keyValuePairs.isEmpty();
     }

src/main/java/net/sf/jsqlparser/expression/JsonTableFunction.java

@@ -33,7 +33,7 @@ public String getDisplay() {
     }
 
     public enum JsonTableOnErrorType {
-        ERROR, EMPTY
+        ERROR, NULL, EMPTY
     }
 
     public static class JsonTablePassingClause extends ASTNodeAccessImpl implements Serializable {
@@ -395,6 +395,7 @@ public static class JsonTableValueColumnDefinition extends JsonTableColumnDefini
         private JsonTableQuotesClause quotesClause;
         private JsonFunction.JsonOnResponseBehavior onEmptyBehavior;
         private JsonFunction.JsonOnResponseBehavior onErrorBehavior;
+        private JsonFunction.ScalarsType scalarsType;
 
         public String getColumnName() {
             return columnName;
@@ -489,6 +490,14 @@ public JsonTableValueColumnDefinition setOnErrorBehavior(
             return this;
         }
 
+        public void setScalarsType(JsonFunction.ScalarsType scalarsType) {
+            this.scalarsType = scalarsType;
+        }
+
+        public JsonFunction.ScalarsType getScalarsType() {
+            return scalarsType;
+        }
+
         @Override
         public void collectExpressions(List<Expression> expressions) {
             if (pathExpression != null) {
@@ -509,14 +518,20 @@ public String toString() {
                 builder.append(" FOR ORDINALITY");
                 return builder.toString();
             }
-
-            builder.append(" ").append(dataType);
+            if (dataType != null) {
+                builder.append(" ").append(dataType);
+            }
             if (formatJson) {
                 builder.append(" FORMAT JSON");
                 if (encoding != null) {
                     builder.append(" ENCODING ").append(encoding);
                 }
             }
+            if (scalarsType != null) {
+                builder.append(" ");
+                builder.append(scalarsType);
+                builder.append(" SCALARS");
+            }
             if (pathExpression != null) {
                 builder.append(" PATH ").append(pathExpression);
             }
@@ -676,7 +691,10 @@ public <T, S> T accept(ExpressionVisitor<T> expressionVisitor, S context) {
     @Override
     public String toString() {
         StringBuilder builder = new StringBuilder("JSON_TABLE(");
-        builder.append(jsonInputExpression).append(", ").append(jsonPathExpression);
+        builder.append(jsonInputExpression);
+        if (jsonPathExpression != null) {
+            builder.append(", ").append(jsonPathExpression);
+        }
         if (pathName != null) {
             builder.append(" AS ").append(pathName);
         }