for (ColumnMetadata column : sourceTableMetadata.getColumns()) {
Field field = Field.newQualified(sourceTable.asQualifiedName(), Optional.of(column.getName()), Type.fromRaw(column.getType()));
Symbol symbol = symbolAllocator.newSymbol(field);
inputColumnsBuilder.put(symbol, sourceTableColumns.get(column.getName()));
ColumnHandle targetColumnHandle = targetTableColumns.get(column.getName());
fields.add(field);
columnHandleBuilder.add(targetColumnHandle);
outputSymbolsBuilder.add(symbol);
}
ImmutableList<Symbol> outputSymbols = outputSymbolsBuilder.build();
plan = new RelationPlan(new TableScanNode(idAllocator.getNextId(), sourceTableHandle, outputSymbols, inputColumnsBuilder.build(), null, Optional.<GeneratedPartitions>absent()), new TupleDescriptor(fields.build()), outputSymbols);
targetColumnHandles = columnHandleBuilder.build();
}
else {
RelationPlanner planner = new RelationPlanner(analysis, symbolAllocator, idAllocator, metadata, session);
plan = planner.process(analysis.getQuery(), null);
// TODO: create table and periodic import in pre-execution step, not here
// Create the destination table
ImmutableList.Builder<ColumnMetadata> columns = ImmutableList.builder();
for (int i = 0; i < plan.getDescriptor().getFields().size(); i++) {
Field field = plan.getDescriptor().getFields().get(i);
String name = field.getName().or("_field" + i);
ColumnMetadata columnMetadata = new ColumnMetadata(name, field.getType().getColumnType(), i, false);
columns.add(columnMetadata);
}
TableMetadata tableMetadata = createTableMetadata(destination, columns.build());
targetTable = metadata.createTable(destination.getCatalogName(), tableMetadata);
// get the column handles for the destination table
Map<String, ColumnHandle> columnHandleIndex = metadata.getColumnHandles(targetTable);
ImmutableList.Builder<ColumnHandle> columnHandleBuilder = ImmutableList.builder();
for (ColumnMetadata column : tableMetadata.getColumns()) {
columnHandleBuilder.add(columnHandleIndex.get(column.getName()));
}
targetColumnHandles = columnHandleBuilder.build();
// find source table (TODO: do this in analyzer)
QueryBody queryBody = analysis.getQuery().getQueryBody();
checkState(queryBody instanceof QuerySpecification, "Query is not a simple select statement");
List<Relation> relations = ((QuerySpecification) queryBody).getFrom();
checkState(relations.size() == 1, "Query has more than one source table");
Relation relation = Iterables.getOnlyElement(relations);
checkState(relation instanceof Table, "FROM clause is not a simple table name");
QualifiedTableName sourceTable = MetadataUtil.createQualifiedTableName(session, ((Table) relation).getName());
// create source table and optional import information
storageManager.insertTableSource(((NativeTableHandle) targetTable), sourceTable);
// if a refresh is present, create a periodic import for this table
if (analysis.getRefreshInterval().isPresent()) {
PeriodicImportJob job = PeriodicImportJob.createJob(sourceTable, destination, analysis.getRefreshInterval().get());
periodicImportManager.insertJob(job);
}
}
// compute input symbol <-> column mappings
ImmutableMap.Builder<Symbol, ColumnHandle> mappings = ImmutableMap.builder();
for (int i = 0; i < targetColumnHandles.size(); i++) {
ColumnHandle column = targetColumnHandles.get(i);
Symbol symbol = plan.getSymbol(i);
mappings.put(symbol, column);
}
// create writer node