Function getEffectiveRowPolicyFilter

src/Planner/PlannerJoinTree.cpp:305–315

Returns the effective row policy filter for the table, or nullptr if the table has no row policies for the current user or the combined filter is always-true. Mirrors the effective-filter check used by buildRowPolicyFilterIfNeeded.

/// always-true. Mirrors the effective-filter check used by
/// buildRowPolicyFilterIfNeeded.
RowPolicyFilterPtr getEffectiveRowPolicyFilter(const StoragePtr & storage, const ContextPtr & query_context)
{
    auto storage_id = storage->getStorageID();
    if (!storage_id.hasDatabase())
        return nullptr;
    auto row_policy_filter = query_context->getRowPolicyFilter(
        storage_id.getDatabaseName(), storage_id.getTableName(), RowPolicyFilterType::SELECT_FILTER);
    if (!row_policy_filter || row_policy_filter->isAlwaysTrue())
        return nullptr;
    return row_policy_filter;
}

bool applyTrivialCountIfPossible(
    QueryPlan & query_plan,