private static int Compare(OrderByColumn c, RowHolder x, RowHolder y)
{
IComparable left = QueryProcessingAccessors.MetadataColumnRowsetHolderFetcher(c.column, x);
IComparable right = QueryProcessingAccessors.MetadataColumnRowsetHolderFetcher(c.column, y);
return((c.direction == OrderByColumn.Direction.Asc) ? left.CompareTo(right) : right.CompareTo(left));
}
private static IComparable ValToIComp(Sql.value op, ref MetadataColumn[] metadataColumns, ref RowHolder rowHolder)
{
if (op.IsId)
{
Sql.value.Id idVal = (Sql.value.Id)op;
MetadataColumn mc = QueryProcessingAccessors.GetMetadataColumn(idVal.Item, metadataColumns);
return(QueryProcessingAccessors.MetadataColumnRowsetHolderFetcher(mc, rowHolder));
}
else if (op.IsFloat)
{
return(((Sql.value.Float)op).Item);
}
else if (op.IsInt)
{
return(((Sql.value.Int)op).Item);
}
else if (op.IsString)
{
return(((Sql.value.String)op).Item);
}
else
{
Debug.Fail("Invalid type");
}
throw new InvalidProgramException("Invalid state.");
}
public async Task <IPhysicalOperator <RowHolder> > BuildStatement(Sql.sqlStatement statement, ITransaction tran, IPhysicalOperator <RowHolder> source, InputStringNormalizer stringNormalizer)
{
if (statement.Joins.Any())
{
IPhysicalOperator <RowHolder> currJoinSource = source;
for (int i = 0; i < statement.Joins.Length; i++)
{
if (!statement.Joins[i].Item2.IsInner)
{
throw new NotSupportedException("Only inner join is supported at this point.");
}
MetadataTable joinRightTable = await this.metadataManager.GetTableManager().GetByName(statement.Joins[i].Item1, tran).ConfigureAwait(false);
PhyOpScan scanOpRight = new PhyOpScan(joinRightTable.Collection, tran, joinRightTable.Columns, joinRightTable.TableName);
Func <RowHolder, bool> filter = (_) => true;
if (FSharpOption <Sql.where> .get_IsSome(statement.Joins[i].Item3))
{
filter = FilterStatementBuilder.EvalWhere(
statement.Joins[i].Item3.Value,
QueryProcessingAccessors.MergeColumns(currJoinSource.GetOutputColumns(), scanOpRight.GetOutputColumns()),
stringNormalizer);
}
currJoinSource = new PhyOpLoopInnerJoin(currJoinSource, scanOpRight, filter);
}
return(currJoinSource);
}
else
{
return(source);
}
}
public PhyOpLoopInnerJoin(IPhysicalOperator <RowHolder> sourceLeft, IPhysicalOperator <RowHolder> sourceRight, Func <RowHolder, bool> filterFunc)
{
this.filterFunc = filterFunc;
this.sourceLeft = sourceLeft;
this.sourceRight = sourceRight;
this.returnMdColumns = QueryProcessingAccessors.MergeColumns(sourceLeft.GetOutputColumns(), sourceRight.GetOutputColumns());
}
public static GroupByFunctors EvalGroupBy(string[] groupByColumns, Sql.columnSelect[] selectColumns, MetadataColumn[] metadataColumns)
{
// Just prototyping for now. This needs a lot of refactoring.
foreach (string groupByColumn in groupByColumns)
{
// Just checking whether all columns have correct name.
var _ = QueryProcessingAccessors.GetMetadataColumn(groupByColumn, metadataColumns);
}
// metadata column, is extended.
(MetadataColumn, bool)[] projectColumns = selectColumns
private OrderByColumn[] GetOrderByColumns(MetadataColumn[] columns, FSharpList <Tuple <string, Sql.dir> > orderBy)
{
OrderByColumn[] orderByColumns = new OrderByColumn[orderBy.Length];
for (int i = 0; i < orderBy.Length; ++i)
{
MetadataColumn column = QueryProcessingAccessors.GetMetadataColumn(orderBy[i].Item1, columns);
OrderByColumn.Direction direction = orderBy[i].Item2 == Sql.dir.Asc ? OrderByColumn.Direction.Asc : OrderByColumn.Direction.Desc;
orderByColumns[i] = new OrderByColumn(column, direction);
}
return(orderByColumns);
}
public Task <IPhysicalOperator <RowHolder> > BuildStatement(Sql.sqlStatement statement, ITransaction tran, IPhysicalOperator <RowHolder> source, InputStringNormalizer inputStringNormalizer)
{
Sql.columnSelect[] columns = new Sql.columnSelect[0];
bool isStar = false;
string[] projections = new string[0];
if (statement.GroupBy.Any())
{
// no job for me, this is group by.
return(Task.FromResult(source));
}
if (!statement.Columns.IsStar)
{
columns = (((Sql.selectType.ColumnList)statement.Columns).Item).ToArray();
if (columns.Any(c => c.IsAggregate == true))
{
// No job for me, this is aggregation.
return(Task.FromResult(source));
}
projections = columns
.Where(c => c.IsProjection == true)
.Select(c => ((Sql.columnSelect.Projection)c).Item).ToArray();
}
else
{
isStar = true;
}
int?topRows = null;
if (FSharpOption <int> .get_IsSome(statement.Top))
{
topRows = statement.Top.Value;
if (topRows < 1)
{
throw new InvalidTopCountException();
}
}
if (isStar)
{
// no need for project, just return everything.
IPhysicalOperator <RowHolder> projectOp = new PhyOpProject(source, topRows);
return(Task.FromResult(projectOp));
}
else
{
// Project Op.
List <MetadataColumn> columnMapping = new List <MetadataColumn>();
foreach (string columnName in projections)
{
MetadataColumn mc = QueryProcessingAccessors.GetMetadataColumn(columnName, source.GetOutputColumns());
columnMapping.Add(mc);
}
IPhysicalOperator <RowHolder> projectOp = new PhyOpProject(source, columnMapping.Select(mc => mc.ColumnId).ToArray(), topRows);
return(Task.FromResult(projectOp));
}
}
