Function hasJoin

src/Interpreters/getHeaderForProcessingStage.cpp:30–38

}

bool hasJoin(const ASTSelectQuery & select)
{
    const auto & tables = select.tables();
    if (!tables || tables->children.size() < 2)
        return false;

    const auto & joined_table = tables->children[1]->as<ASTTablesInSelectQueryElement &>();
    return joined_table.table_join != nullptr;
}

bool hasArrayJoin(const ASTSelectQuery & select)
{