HeavyDBView.java

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/*
 * Copyright 2022 HEAVY.AI, Inc.
 *
 * 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.mapd.calcite.parser;

import static com.mapd.calcite.parser.HeavyDBParser.CURRENT_PARSER;

import com.mapd.calcite.parser.HeavyDBParserOptions;

import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.prepare.SqlIdentifierCapturer;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelRoot;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.TranslatableTable;
import org.apache.calcite.sql.parser.SqlParseException;
import org.apache.calcite.tools.RelConversionException;
import org.apache.calcite.tools.ValidationException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;

import ai.heavy.thrift.server.TTableDetails;

public class HeavyDBView extends HeavyDBTable implements TranslatableTable {
  final static Logger HEAVYDBLOGGER = LoggerFactory.getLogger(HeavyDBView.class);
  private final String viewSql;
  private SqlIdentifierCapturer accessObjects;
  private RelRoot viewRelRoot;

  public HeavyDBView(String view_sql, TTableDetails ri, HeavyDBParser mp) {
    super(ri);
    this.viewSql = view_sql;
    try {
      HeavyDBParserOptions parserOptions = new HeavyDBParserOptions();
      viewRelRoot = mp.queryToRelNode(viewSql, parserOptions);
      accessObjects = mp.captureIdentifiers(viewSql, parserOptions.isLegacySyntax());
    } catch (SqlParseException e) {
      HEAVYDBLOGGER.error("error parsing view SQL: " + view_sql, e);
    } catch (ValidationException ex) {
      HEAVYDBLOGGER.error("error validating view SQL: " + view_sql, ex);
    } catch (RelConversionException ex) {
      HEAVYDBLOGGER.error("error doing Rel Conversion view SQL: " + view_sql, ex);
    }
  }

  public String toString() {
    return "View SQL: " + viewSql + "\n"
            + "Accessed Objects\n" + accessObjects;
  }

  public SqlIdentifierCapturer getAccessedObjects() {
    return accessObjects;
  }

  String getViewSql() {
    return viewSql;
  }

  @Override
  public Schema.TableType getJdbcTableType() {
    return Schema.TableType.VIEW;
  }

  @Override
  public RelNode toRel(RelOptTable.ToRelContext context, RelOptTable relOptTable) {
    return viewRelRoot.rel;
  }

  @Override
  public RelDataType getRowType(RelDataTypeFactory rdtf) {
    return viewRelRoot.validatedRowType;
  }
}