/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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 org.apache.calcite.sql.validate;

import org.apache.calcite.linq4j.Linq4j;
import org.apache.calcite.sql.SqlNode;

import com.google.common.collect.ImmutableList;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Implementation of {@link SqlValidatorScope} that can see all schemas in the
 * current catalog.
 *
 * <p>Occurs near the root of the scope stack; its parent is typically
 * {@link EmptyScope}.
 *
 * <p>Helps resolve {@code schema.table.column} column references, such as
 *
 * <blockquote><pre>select sales.emp.empno from sales.emp</pre></blockquote>
 */
class CatalogScope extends DelegatingScope {
  /** Fully-qualified name of the catalog. Typically empty or ["CATALOG"]. */
  final ImmutableList<String> names;
  private final Set<List<String>> schemaNames;

  //~ Constructors -----------------------------------------------------------

  CatalogScope(SqlValidatorScope parent, List<String> names) {
    super(parent);
    this.names = ImmutableList.copyOf(names);
    this.schemaNames =
        Linq4j.asEnumerable(
            validator.getCatalogReader()
                .getAllSchemaObjectNames(ImmutableList.of()))
            .where(input -> input.getType() == SqlMonikerType.SCHEMA)
            .select(SqlMoniker::getFullyQualifiedNames)
            .into(new HashSet<>());
  }

  //~ Methods ----------------------------------------------------------------

  public SqlNode getNode() {
    throw new UnsupportedOperationException();
  }

}

// End CatalogScope.java

@@ -837,49 +837,8 @@
 e;%0A%0A
-import org.apache.calcite.linq4j.Linq4j;%0A
 impo
@@ -872,16 +872,16 @@
 qlNode;%0A
+
 %0Aimport 
@@ -943,59 +943,11 @@
 til.
-HashSet;%0Aimport java.util.List;%0Aimport java.util.Se
+Lis
 t;%0A%0A
@@ -1471,55 +1471,8 @@
 mes;
-%0A  private final Set%3CList%3CString%3E%3E schemaNames;
 %0A%0A  
@@ -1631,16 +1631,16 @@
 arent);%0A
+
     this
@@ -1681,325 +1681,8 @@
 s);%0A
-    this.schemaNames =%0A        Linq4j.asEnumerable(%0A            validator.getCatalogReader()%0A                .getAllSchemaObjectNames(ImmutableList.of()))%0A            .where(input -%3E input.getType() == SqlMonikerType.SCHEMA)%0A            .select(SqlMoniker::getFullyQualifiedNames)%0A            .into(new HashSet%3C%3E());%0A
   %7D%0A

Remove call to CatalogReader#getAllSchemaObjects