/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.sql.tree;

import java.util.Optional;

import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;

public class ShowSchemas
        extends Statement
{
    private final Optional<String> catalog;

    public ShowSchemas(Optional<String> catalog)
    {
        this(Optional.empty(), catalog);
    }

    public ShowSchemas(NodeLocation location, Optional<String> catalog)
    {
        this(Optional.of(location), catalog);
    }

    private ShowSchemas(Optional<NodeLocation> location, Optional<String> catalog)
    {
        super(location);
        this.catalog = requireNonNull(catalog, "catalog is null");
    }

    public Optional<String> getCatalog()
    {
        return catalog;
    }

    @Override
    public <R, C> R accept(AstVisitor<R, C> visitor, C context)
    {
        return visitor.visitShowSchemas(this, context);
    }

    @Override
    public int hashCode()
    {
        return 0;
    }

    @Override
    public boolean equals(Object obj)
    {
        if (this == obj) {
            return true;
        }
        return (obj != null) && (getClass() == obj.getClass());
    }

    @Override
    public String toString()
    {
        return toStringHelper(this).toString();
    }
}

@@ -594,16 +594,42 @@
 .tree;%0A%0A
+import java.util.Objects;%0A
 import j
@@ -1568,17 +1568,34 @@
  return 
-0
+catalog.hashCode()
 ;%0A    %7D%0A
@@ -1727,29 +1727,26 @@
     
-return 
+if (
 (obj 
-!
+=
 = null) 
 && (
@@ -1745,10 +1745,10 @@
 ll) 
-&&
+%7C%7C
  (ge
@@ -1756,17 +1756,17 @@
 Class() 
-=
+!
 = obj.ge
@@ -1774,16 +1774,148 @@
 Class())
+) %7B%0A            return false;%0A        %7D%0A        ShowSchemas o = (ShowSchemas) obj;%0A        return Objects.equals(catalog, o.catalog)
 ;%0A    %7D%0A
@@ -1999,16 +1999,74 @@
 er(this)
+%0A                .add(%22catalog%22, catalog)%0A                
 .toStrin

Fix equals, hashCode, toString for ShowSchemas