protected override Expression VisitSqlFunction(SqlFunctionExpression sqlFunctionExpression)
{
Check.NotNull(sqlFunctionExpression, nameof(sqlFunctionExpression));
var canOptimize = _canOptimize;
_canOptimize = false;
if (sqlFunctionExpression.IsBuiltIn &&
string.Equals(sqlFunctionExpression.Name, "COALESCE", StringComparison.OrdinalIgnoreCase))
{
_isNullable = false;
var newLeft = (SqlExpression)Visit(sqlFunctionExpression.Arguments[0]);
var leftNullable = _isNullable;
_isNullable = false;
var newRight = (SqlExpression)Visit(sqlFunctionExpression.Arguments[1]);
var rightNullable = _isNullable;
_isNullable = leftNullable && rightNullable;
_canOptimize = canOptimize;
return(sqlFunctionExpression.Update(sqlFunctionExpression.Instance, new[] { newLeft, newRight }));
}
var newInstance = (SqlExpression)Visit(sqlFunctionExpression.Instance);
var newArguments = new SqlExpression[sqlFunctionExpression.Arguments.Count];
for (var i = 0; i < newArguments.Length; i++)
{
newArguments[i] = (SqlExpression)Visit(sqlFunctionExpression.Arguments[i]);
}
_canOptimize = canOptimize;
// TODO: #18555
_isNullable = true;
return(sqlFunctionExpression.Update(newInstance, newArguments));
}
private SqlFunctionExpression VisitSqlFunctionExpression(SqlFunctionExpression sqlFunctionExpression)
{
var newInstance = (SqlExpression)Visit(sqlFunctionExpression.Instance);
var isNullable = _isNullable;
var newArguments = new SqlExpression[sqlFunctionExpression.Arguments.Count];
for (var i = 0; i < newArguments.Length; i++)
{
newArguments[i] = (SqlExpression)Visit(sqlFunctionExpression.Arguments[i]);
isNullable |= _isNullable;
}
_isNullable = isNullable;
return(sqlFunctionExpression.Update(newInstance, newArguments));
}
protected override Expression VisitSqlFunction(SqlFunctionExpression sqlFunctionExpression)
{
var parentSearchCondition = _isSearchCondition;
_isSearchCondition = false;
var instance = (SqlExpression)Visit(sqlFunctionExpression.Instance);
var arguments = new SqlExpression[sqlFunctionExpression.Arguments.Count];
for (var i = 0; i < arguments.Length; i++)
{
arguments[i] = (SqlExpression)Visit(sqlFunctionExpression.Arguments[i]);
}
_isSearchCondition = parentSearchCondition;
var newFunction = sqlFunctionExpression.Update(instance, arguments);
var condition = string.Equals(sqlFunctionExpression.FunctionName, "FREETEXT") ||
string.Equals(sqlFunctionExpression.FunctionName, "CONTAINS");
return(ApplyConversion(newFunction, condition));
}
protected override Expression VisitSqlFunction(SqlFunctionExpression sqlFunctionExpression)
{
var canOptimize = _canOptimize;
_canOptimize = false;
var newInstance = (SqlExpression)Visit(sqlFunctionExpression.Instance);
var newArguments = new SqlExpression[sqlFunctionExpression.Arguments.Count];
for (var i = 0; i < newArguments.Length; i++)
{
newArguments[i] = (SqlExpression)Visit(sqlFunctionExpression.Arguments[i]);
}
_canOptimize = canOptimize;
// TODO: #18555
_isNullable = true;
return(sqlFunctionExpression.Update(newInstance, newArguments));
}
protected override Expression VisitSqlFunction(SqlFunctionExpression x)
{
return(x?.Update(x.Instance.VisitNode(this) as SqlExpression, x.Arguments.VisitAll(this)));
}
