@Override
public PlannedAnalyzedRelation visitQueriedTable(QueriedTable table, ConsumerContext context) {
TableRelation tableRelation = table.tableRelation();
if (table.querySpec().where().hasVersions()) {
context.validationException(new VersionInvalidException());
return null;
}
TableInfo tableInfo = tableRelation.tableInfo();
if (tableInfo.schemaInfo().systemSchema() && table.querySpec().where().hasQuery()) {
ensureNoLuceneOnlyPredicates(table.querySpec().where().query());
}
if (table.querySpec().hasAggregates()) {
return GlobalAggregateConsumer.globalAggregates(
functions, table, tableRelation, table.querySpec().where(), context);
} else {
return normalSelect(table, table.querySpec().where(), tableRelation, context);
}
}
private PlannedAnalyzedRelation normalSelect(
QueriedTable table,
WhereClause whereClause,
TableRelation tableRelation,
ConsumerContext context) {
QuerySpec querySpec = table.querySpec();
TableInfo tableInfo = tableRelation.tableInfo();
List<Symbol> outputSymbols;
if (tableInfo.schemaInfo().systemSchema()) {
outputSymbols = tableRelation.resolve(querySpec.outputs());
} else {
outputSymbols = new ArrayList<>(querySpec.outputs().size());
for (Symbol symbol : querySpec.outputs()) {
outputSymbols.add(
DocReferenceConverter.convertIfPossible(tableRelation.resolve(symbol), tableInfo));
}
}
CollectNode collectNode;
MergeNode mergeNode = null;
OrderBy orderBy = querySpec.orderBy();
if (context.rootRelation() != table) {
// insert directly from shards
assert !querySpec.isLimited()
: "insert from sub query with limit or order by is not supported. "
+ "Analyzer should have thrown an exception already.";
ImmutableList<Projection> projections = ImmutableList.<Projection>of();
collectNode =
PlanNodeBuilder.collect(
context.plannerContext().jobId(),
tableInfo,
context.plannerContext(),
whereClause,
outputSymbols,
projections);
} else if (querySpec.isLimited() || orderBy != null) {
/**
* select id, name, order by id, date
*
* <p>toCollect: [id, name, date] // includes order by symbols, that aren't already selected
* allOutputs: [in(0), in(1), in(2)] // for topN projection on shards/collectNode
* orderByInputs: [in(0), in(2)] // for topN projection on shards/collectNode AND handler
* finalOutputs: [in(0), in(1)] // for topN output on handler -> changes output to what
* should be returned.
*/
List<Symbol> toCollect;
List<Symbol> orderByInputColumns = null;
if (orderBy != null) {
List<Symbol> orderBySymbols = tableRelation.resolve(orderBy.orderBySymbols());
toCollect = new ArrayList<>(outputSymbols.size() + orderBySymbols.size());
toCollect.addAll(outputSymbols);
// note: can only de-dup order by symbols due to non-deterministic functions like select
// random(), random()
for (Symbol orderBySymbol : orderBySymbols) {
if (!toCollect.contains(orderBySymbol)) {
toCollect.add(orderBySymbol);
}
}
orderByInputColumns = new ArrayList<>();
for (Symbol symbol : orderBySymbols) {
orderByInputColumns.add(new InputColumn(toCollect.indexOf(symbol), symbol.valueType()));
}
} else {
toCollect = new ArrayList<>(outputSymbols.size());
toCollect.addAll(outputSymbols);
}
List<Symbol> allOutputs = new ArrayList<>(toCollect.size()); // outputs from collector
for (int i = 0; i < toCollect.size(); i++) {
allOutputs.add(new InputColumn(i, toCollect.get(i).valueType()));
}
List<Symbol> finalOutputs =
new ArrayList<>(outputSymbols.size()); // final outputs on handler after sort
for (int i = 0; i < outputSymbols.size(); i++) {
finalOutputs.add(new InputColumn(i, outputSymbols.get(i).valueType()));
}
// if we have an offset we have to get as much docs from every node as we have offset+limit
// otherwise results will be wrong
TopNProjection tnp;
int limit = firstNonNull(querySpec.limit(), Constants.DEFAULT_SELECT_LIMIT);
if (orderBy == null) {
tnp = new TopNProjection(querySpec.offset() + limit, 0);
} else {
tnp =
new TopNProjection(
querySpec.offset() + limit,
0,
orderByInputColumns,
orderBy.reverseFlags(),
orderBy.nullsFirst());
}
tnp.outputs(allOutputs);
collectNode =
PlanNodeBuilder.collect(
context.plannerContext().jobId(),
tableInfo,
context.plannerContext(),
whereClause,
toCollect,
ImmutableList.<Projection>of(tnp));
// MERGE
tnp = new TopNProjection(limit, querySpec.offset());
tnp.outputs(finalOutputs);
if (orderBy == null) {
// no sorting needed
mergeNode =
PlanNodeBuilder.localMerge(
context.plannerContext().jobId(),
ImmutableList.<Projection>of(tnp),
collectNode,
context.plannerContext());
} else {
// no order by needed in TopN as we already sorted on collector
// and we merge sorted with SortedBucketMerger
mergeNode =
PlanNodeBuilder.sortedLocalMerge(
context.plannerContext().jobId(),
ImmutableList.<Projection>of(tnp),
orderBy,
allOutputs,
orderByInputColumns,
collectNode,
context.plannerContext());
}
} else {
collectNode =
PlanNodeBuilder.collect(
context.plannerContext().jobId(),
tableInfo,
context.plannerContext(),
whereClause,
outputSymbols,
ImmutableList.<Projection>of());
mergeNode =
PlanNodeBuilder.localMerge(
context.plannerContext().jobId(),
ImmutableList.<Projection>of(),
collectNode,
context.plannerContext());
}
return new QueryAndFetch(collectNode, mergeNode, context.plannerContext().jobId());
}