@Override
protected Type visitSubqueryExpression(SubqueryExpression node, AnalysisContext context) {
StatementAnalyzer analyzer = statementAnalyzerFactory.apply(node);
TupleDescriptor descriptor = analyzer.process(node.getQuery(), context);
// Scalar subqueries should only produce one column
if (descriptor.getVisibleFieldCount() != 1) {
throw new SemanticException(
MULTIPLE_FIELDS_FROM_SCALAR_SUBQUERY,
node,
"Subquery expression must produce only one field. Found %s",
descriptor.getVisibleFieldCount());
}
Type type = Iterables.getOnlyElement(descriptor.getVisibleFields()).getType();
expressionTypes.put(node, type);
return type;
}
