add isCipherColumn()

sharding-core/sharding-core-common/src/main/java/org/apache/shardingsphere/core/rule/EncryptRule.java

@@ -182,6 +182,20 @@ public final class EncryptRule implements BaseRule {
         return tables.get(logicTable).getCipherColumns();
     }
     
+    /**
+     * Is cipher column or not.
+     *
+     * @param columnName column name
+     * @return cipher column or not
+     */
+    public boolean isCipherColumn(final String columnName) {
+        Collection<String> result = new LinkedList<>();
+        for (EncryptTable each : tables.values()) {
+            result.addAll(each.getCipherColumns());
+        }
+        return result.contains(columnName);
+    }
+    
     /**
      * Get assisted query column.
      *

sharding-core/sharding-core-common/src/main/java/org/apache/shardingsphere/core/strategy/encrypt/EncryptTable.java

@@ -130,9 +130,7 @@ public final class EncryptTable {
     public Collection<String> getCipherColumns() {
         Collection<String> result = new LinkedList<>();
         for (EncryptColumn each : columns.values()) {
-            if (each.getPlainColumn().isPresent()) {
-                result.add(each.getCipherColumn());
-            }
+            result.add(each.getCipherColumn());
         }
         return result;
     }