private void CheckJoinCondition(SqlExpression expr)
{
switch (expr.NodeType)
{
case SqlNodeType.EQ:
case SqlNodeType.EQ2V:
{
SqlBinary binary2 = (SqlBinary)expr;
SqlColumnRef left = binary2.Left as SqlColumnRef;
SqlColumnRef right = binary2.Right as SqlColumnRef;
if ((left != null) && (right != null))
{
SqlColumn rootColumn = left.GetRootColumn();
SqlColumn column2 = right.GetRootColumn();
this.map[rootColumn] = column2;
this.map[column2] = rootColumn;
}
return;
}
case SqlNodeType.And:
{
SqlBinary binary = (SqlBinary)expr;
this.CheckJoinCondition(binary.Left);
this.CheckJoinCondition(binary.Right);
return;
}
}
}
internal bool AreEquivalent(SqlExpression e1, SqlExpression e2)
{
SqlColumn column3;
if (SqlComparer.AreEqual(e1, e2))
{
return(true);
}
SqlColumnRef ref2 = e1 as SqlColumnRef;
SqlColumnRef ref3 = e2 as SqlColumnRef;
if ((ref2 == null) || (ref3 == null))
{
return(false);
}
SqlColumn rootColumn = ref2.GetRootColumn();
SqlColumn column2 = ref3.GetRootColumn();
return(this.map.TryGetValue(rootColumn, out column3) && (column3 == column2));
}
