private void ResolveColumnRefernecesInUnionOrderBy()
{
int orderLength = this.ExprSortAndSlice.GetOrderLength();
if (orderLength != 0)
{
string[] columnNames = this.GetColumnNames();
int num2 = 0;
while (num2 < orderLength)
{
ExpressionOrderBy by = this.ExprSortAndSlice.ExprList[num2];
Expression leftNode = by.GetLeftNode();
if (leftNode.GetExprType() == 1)
{
if (leftNode.GetDataType().TypeCode != 4)
{
goto Label_00B0;
}
int num3 = Convert.ToInt32(leftNode.GetValue(null));
if ((0 >= num3) || (num3 > columnNames.Length))
{
goto Label_00B0;
}
by.GetLeftNode().QueryTableColumnIndex = num3 - 1;
}
else
{
if (leftNode.GetExprType() != 2)
{
goto Label_00B0;
}
int num4 = ArrayUtil.Find(columnNames, leftNode.GetColumnName());
if (num4 < 0)
{
goto Label_00B0;
}
by.GetLeftNode().QueryTableColumnIndex = num4;
}
num2++;
continue;
Label_00B0:
throw Error.GetError(0x15c8);
}
this.ExprSortAndSlice.Prepare(null);
}
}
public void Prepare(QuerySpecification select)
{
this.ColumnCount = this.ExprList.Count;
if (this.ColumnCount != 0)
{
this.SortOrder = new int[this.ColumnCount];
this.SortDescending = new bool[this.ColumnCount];
this.SortNullsLast = new bool[this.ColumnCount];
for (int i = 0; i < this.ColumnCount; i++)
{
ExpressionOrderBy by = this.ExprList[i];
if (by.GetLeftNode().QueryTableColumnIndex == -1)
{
this.SortOrder[i] = select.IndexStartOrderBy + i;
}
else
{
this.SortOrder[i] = by.GetLeftNode().QueryTableColumnIndex;
}
this.SortDescending[i] = by.IsDescending();
this.SortNullsLast[i] = by.IsNullsLast();
this.HasNullsLast |= this.SortNullsLast[i];
}
if (((select != null) && !this.HasNullsLast) && (!select.IsDistinctSelect && !(select.IsGrouped | select.IsAggregated)))
{
int[] numArray = new int[this.ColumnCount];
for (int j = 0; j < this.ColumnCount; j++)
{
Expression leftNode = this.ExprList[j].GetLeftNode();
if (leftNode.GetExprType() != 2)
{
return;
}
if (leftNode.GetRangeVariable() != select.RangeVariables[0])
{
return;
}
numArray[j] = leftNode.ColumnIndex;
}
this._columnIndexes = numArray;
}
}
}
