content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.plan.common.item.function.castfunc;
  
  import com.actiontech.dble.plan.common.field.Field;
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.function.timefunc.ItemDateFunc;
  import com.actiontech.dble.plan.common.time.MySQLTime;
  import com.actiontech.dble.plan.common.time.MySQLTimestampType;
  import com.actiontech.dble.plan.common.time.MyTime;
  import com.alibaba.druid.sql.ast.SQLDataTypeImpl;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.expr.SQLCastExpr;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class ItemDateTypeCast extends ItemDateFunc {
      public ItemDateTypeCast(Item a, int charsetIndex) {
          super(new ArrayList<Item>(), charsetIndex);
          args.add(a);
          maybeNull = true;
      }
  
      @Override
      public final String funcName() {
          return "cast_as_date";
      }
  
      @Override
      public boolean getDate(MySQLTime ltime, long fuzzyDate) {
          final boolean res = getArg0Date(ltime, fuzzyDate | MyTime.TIME_NO_DATE_FRAC_WARN);
          ltime.setSecondPart(0);
          ltime.setSecond(0);
          ltime.setMinute(0);
          ltime.setHour(0);
          ltime.setTimeType(MySQLTimestampType.MYSQL_TIMESTAMP_DATE);
          return res;
      }
  
      @Override
      public SQLExpr toExpression() {
          SQLCastExpr cast = new SQLCastExpr();
          cast.setExpr(args.get(0).toExpression());
          SQLDataTypeImpl dataType = new SQLDataTypeImpl("DATE");
          cast.setDataType(dataType);
          return cast;
      }
  
      @Override
      protected Item cloneStruct(boolean forCalculate, List<Item> calArgs, boolean isPushDown, List<Field> fields) {
          List<Item> newArgs = null;
          if (!forCalculate)
              newArgs = cloneStructList(args);
          else
              newArgs = calArgs;
          return new ItemDateTypeCast(newArgs.get(0), charsetIndex);
      }
  
  }
  