public override CosmosElement Visit(SqlCoalesceScalarExpression scalarExpression, CosmosElement document)
{
CosmosElement left = scalarExpression.Left.Accept(this, document);
CosmosElement right = scalarExpression.Right.Accept(this, document);
return(left != Undefined ? left : right);
}
public override int Visit(SqlCoalesceScalarExpression sqlCoalesceScalarExpression)
{
int hashCode = SqlCoalesceScalarExpressionHashCode;
hashCode = CombineHashes(hashCode, sqlCoalesceScalarExpression.Left.Accept(this));
hashCode = CombineHashes(hashCode, sqlCoalesceScalarExpression.Right.Accept(this));
return(hashCode);
}
public override void Visit(SqlCoalesceScalarExpression sqlCoalesceScalarExpression)
{
this.writer.Write("(");
sqlCoalesceScalarExpression.Left.Accept(this);
this.writer.Write(" ?? ");
sqlCoalesceScalarExpression.Right.Accept(this);
this.writer.Write(")");
}
public override SqlObject VisitCoalesceScalarExpression([NotNull] sqlParser.CoalesceScalarExpressionContext context)
{
Contract.Requires(context != null);
// scalar_expression '??' scalar_expression
SqlScalarExpression left = (SqlScalarExpression)this.Visit(context.scalar_expression(0));
SqlScalarExpression right = (SqlScalarExpression)this.Visit(context.scalar_expression(1));
return(SqlCoalesceScalarExpression.Create(left, right));
}
public override bool Visit(SqlCoalesceScalarExpression first, SqlObject secondAsObject)
{
if (!(secondAsObject is SqlCoalesceScalarExpression second))
{
return(false);
}
if (!Equals(first.Left, second.Left))
{
return(false);
}
if (!Equals(first.Right, second.Right))
{
return(false);
}
return(true);
}
public void SqlCoalesceScalarExpressionTest()
{
SqlLiteralScalarExpression nullLiteral = SqlLiteralScalarExpression.Create(SqlNullLiteral.Singleton);
SqlLiteralScalarExpression undefinedLiteral = SqlLiteralScalarExpression.Create(SqlUndefinedLiteral.Create());
SqlLiteralScalarExpression five = SqlLiteralScalarExpression.Create(SqlNumberLiteral.Create(5));
SqlLiteralScalarExpression three = SqlLiteralScalarExpression.Create(SqlNumberLiteral.Create(3));
SqlCoalesceScalarExpression nullCoalesceFive = SqlCoalesceScalarExpression.Create(nullLiteral, five);
AssertEvaluation(CosmosNull.Create(), nullCoalesceFive);
SqlCoalesceScalarExpression undefinedCoalesceFive = SqlCoalesceScalarExpression.Create(undefinedLiteral, five);
AssertEvaluation(CosmosNumber64.Create(5), undefinedCoalesceFive);
SqlCoalesceScalarExpression threeCoalesceFive = SqlCoalesceScalarExpression.Create(three, five);
AssertEvaluation(CosmosNumber64.Create(3), threeCoalesceFive);
}
public override bool Visit(SqlCoalesceScalarExpression scalarExpression)
{
if (this.MatchesGroupByExpression(scalarExpression))
{
return(true);
}
if (!scalarExpression.Left.Accept(this))
{
return(false);
}
if (!scalarExpression.Right.Accept(this))
{
return(false);
}
return(true);
}
public abstract void Visit(SqlCoalesceScalarExpression sqlObject);
public override SqlObject Visit(SqlCoalesceScalarExpression sqlCoalesceScalarExpression)
{
return(SqlCoalesceScalarExpression.Create(
sqlCoalesceScalarExpression.Left.Accept(this) as SqlScalarExpression,
sqlCoalesceScalarExpression.Right.Accept(this) as SqlScalarExpression));
}
public abstract void Visit(SqlCoalesceScalarExpression scalarExpression);
public override bool Visit(SqlCoalesceScalarExpression sqlCoalesceScalarExpression)
{
return(sqlCoalesceScalarExpression.Left.Accept(this) ||
sqlCoalesceScalarExpression.Right.Accept(this));
}
public abstract TResult Visit(SqlCoalesceScalarExpression sqlObject);
public abstract TOutput Visit(SqlCoalesceScalarExpression sqlObject, TArg input);
public abstract TResult Visit(SqlCoalesceScalarExpression scalarExpression);
