// Reads //
public static StagedReadName RenderStagedReadPlan(Workspace Home, HScriptParser.Crudam_readContext context)
{
// Get the data source //
DataSet data = VisitorHelper.GetData(Home, context.full_table_name());
string alias =
(context.K_AS() != null)
? context.IDENTIFIER().GetText()
: data.Name;
// Create a local heap to work off of //
MemoryStruct local_heap = new MemoryStruct(true);
// Create a record register //
StreamRegister memory = new StreamRegister(null);
// Create expression visitor //
ExpressionVisitor exp_vis = new ExpressionVisitor(local_heap, Home, alias, data.Columns, memory);
// Where clause //
Predicate where = VisitorHelper.GetWhere(exp_vis, context.where_clause());
// Create a reader //
RecordReader reader = data.OpenReader(where);
// Attach the reader to the register //
memory.BaseStream = reader;
// Create the action visitor //
ActionVisitor act_vis = new ActionVisitor(Home, local_heap, exp_vis);
// Get the declarations //
if (context.crudam_declare_many() != null)
{
VisitorHelper.AllocateMemory(Home, local_heap, exp_vis, context.crudam_declare_many());
}
// Get the initial actionset //
TNode pre_run =
(context.init_action() != null)
? act_vis.ToNode(context.init_action().query_action())
: new TNodeNothing(null);
// Get the main actionset //
TNode run = act_vis.ToNode(context.main_action().query_action());
// Get the final actionset //
TNode post_run =
(context.final_action() != null)
? act_vis.ToNode(context.final_action().query_action())
: new TNodeNothing(null);
return new StagedReadName(reader, pre_run, run, post_run);
}
private static void AppendSet(ExpressionVisitor Evaluator, FNodeSet Fields, HScriptParser.EOW_tables_starContext context)
{
if (Evaluator.Columns.Count == 0)
return; // no need to toss an exception
string alias = Evaluator.Columns.Keys.First();
FNodeSet nodes = new FNodeSet(Evaluator.Columns[alias]);
nodes.AssignRegister(Evaluator.Registers[alias]);
string suffix = (context.K_AS() == null) ? null : context.IDENTIFIER().GetText();
for (int i = 0; i < nodes.Count; i++)
{
Fields.Add((suffix == null) ? nodes.Alias(i) : suffix + nodes.Alias(i), nodes[i]);
}
}
private static void AppendSet(ExpressionVisitor Evaluator, FNodeSet Fields, HScriptParser.EOW_table_starContext context)
{
string alias = context.IDENTIFIER()[0].GetText();
if (!Evaluator.Columns.ContainsKey(alias))
throw new Exception(string.Format("Alias '{0}' does not exist", alias));
FNodeSet nodes = new FNodeSet(Evaluator.Columns[alias]);
nodes.AssignRegister(Evaluator.Registers[alias]);
string suffix = (context.K_AS() == null) ? null : context.IDENTIFIER()[1].GetText();
for (int i = 0; i < nodes.Count; i++)
{
Fields.Add((suffix == null) ? nodes.Alias(i) : suffix + nodes.Alias(i), nodes[i]);
}
}
private static void AppendSet(ExpressionVisitor Evaluator, FNodeSet Fields, HScriptParser.EOW_global_starContext context)
{
string suffix =
(context.K_AS() == null)
? null
: context.IDENTIFIER().GetText();
for (int i = 0; i < Evaluator.GlobalHeap.Scalars.Count; i++)
{
string alias =
(suffix == null)
? Evaluator.LocalHeap.Scalars.Name(i)
: suffix + Evaluator.LocalHeap.Scalars.Name(i);
FNode node = new FNodeHeapRef(null, Evaluator.GlobalHeap, i);
Fields.Add(alias, node);
}
}
public static FastReadPlan RenderFastReadPlan(Workspace Home, HScriptParser.Crudam_read_fastContext context)
{
// Get the data source //
DataSet data = VisitorHelper.GetData(Home, context.full_table_name());
string alias =
(context.K_AS() != null)
? context.IDENTIFIER().GetText()
: data.Name;
// Create a record register //
StreamRegister memory = new StreamRegister(null);
// Create expression visitor //
ExpressionVisitor exp_vis = new ExpressionVisitor(new MemoryStruct(true), Home, alias, data.Columns, memory);
// Where clause //
Predicate where = VisitorHelper.GetWhere(exp_vis, context.where_clause());
// Create a reader //
RecordReader reader = data.OpenReader(where);
// Attach the reader to the register //
memory.BaseStream = reader;
// Get the fields being returned //
FNodeSet nodes = VisitorHelper.GetReturnStatement(exp_vis, context.return_action().expression_or_wildcard_set());
// Get the output cursor from the return statement //
RecordWriter writer = VisitorHelper.GetWriter(Home, nodes.Columns, context.return_action());
return new FastReadPlan(data, where, nodes, writer);
}
public static PartitionedAggregatePlan RenderPartitionedAggregatePlan(Workspace Home, HScriptParser.Crudam_aggregateContext context)
{
// Get the data source //
DataSet data = VisitorHelper.GetData(Home, context.full_table_name());
string alias =
(context.K_AS() != null)
? context.IDENTIFIER().GetText()
: data.Name;
// Create a register //
StaticRegister memory = new StaticRegister(null);
// Create expression visitor //
ExpressionVisitor exp_vis = new ExpressionVisitor(null, Home, alias, data.Columns, memory);
// Get where //
Predicate where = VisitorHelper.GetWhere(exp_vis, context.where_clause());
// Get the reader //
//RecordReader reader = data.OpenReader(where);
// Get the keys //
FNodeSet keys =
(context.K_BY() != null)
? exp_vis.ToNodes(context.expression_alias_list())
: new FNodeSet();
// Get the reducers //
AggregateSet values =
(context.K_OVER() != null)
? exp_vis.ToReducers(context.beta_reduction_list())
: new AggregateSet();
// Create a second register for the return memory //
StaticRegister return_memory = new StaticRegister(null);
// Need to build a visitor off of the aggregator schema //
ExpressionVisitor agg_vis = new ExpressionVisitor(null, Home, "agg", AggregatePlan.GetInterimSchema(keys, values), return_memory);
// Get the output //
FNodeSet return_vars = VisitorHelper.GetReturnStatement(agg_vis, context.return_action().expression_or_wildcard_set());
// Get the output cursor //
RecordWriter out_put_writter = VisitorHelper.GetWriter(Home, return_vars.Columns, context.return_action());
// Get the partitioner //
int Partitions = VisitorHelper.GetPartitions(exp_vis, context.partitions());
return new PartitionedAggregatePlan(out_put_writter, data, where, keys, values, return_vars, Home.TempSpace, Partitions);
}
internal static ReadMapNode RenderMapNode(Workspace Home, int PartitionID, HScriptParser.Crudam_read_maprContext context)
{
// Get the data source //
DataSet data = VisitorHelper.GetData(Home, context.full_table_name());
string alias =
(context.K_AS() != null)
? context.IDENTIFIER().GetText()
: data.Name;
// Create a local heap to work off of //
MemoryStruct local_heap = new MemoryStruct(true);
// Create a record register //
StaticRegister memory = new StaticRegister(null);
// Create expression visitor //
ExpressionVisitor exp_vis = new ExpressionVisitor(local_heap, Home, alias, data.Columns, memory);
// Where clause //
Predicate where = VisitorHelper.GetWhere(exp_vis, context.where_clause());
// Create a reader //
RecordReader reader = data.OpenReader(where);
// Get the declarations //
if (context.crudam_declare_many() != null)
{
VisitorHelper.AllocateMemory(Home, local_heap, exp_vis, context.crudam_declare_many());
}
// Get the map actions //
ActionVisitor act_vis = new ActionVisitor(Home, local_heap, exp_vis);
act_vis.IsAsync = true;
TNode map = act_vis.ToNode(context.map_action().query_action());
// Get the reduce actions //
act_vis = new ActionVisitor(Home, local_heap, exp_vis);
act_vis.IsAsync = false;
TNode red = act_vis.ToNode(context.reduce_action().query_action());
ReadMapNode node = new ReadMapNode(PartitionID, map, red, memory, where);
return node;
}
