/* * Copyright (C) 2016-2020 ActionTech. * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher. */ package com.actiontech.dble.plan.common.item.function.operator.cmpfunc; import com.actiontech.dble.plan.common.field.Field; import com.actiontech.dble.plan.common.item.Item; import com.alibaba.druid.sql.ast.SQLExpr; import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr; import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator; import com.alibaba.druid.sql.ast.expr.SQLBooleanExpr; import java.util.List; /** * This Item represents a <code>X IS TRUE</code> boolean predicate. */ public class ItemFuncIstrue extends ItemFuncTruth { public ItemFuncIstrue(Item a) { super(a, true, true); } @Override public final String funcName() { return "istrue"; } @Override public SQLExpr toExpression() { SQLExpr left = args.get(0).toExpression(); return new SQLBinaryOpExpr(left, SQLBinaryOperator.Is, new SQLBooleanExpr(true)); } @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 ItemFuncIstrue(newArgs.get(0)); } }