Method checkPartitionKeyAndInitMinMax

src/MergeTreeCommon/MergeTreeMetaBase.cpp:444–497

}

void MergeTreeMetaBase::checkPartitionKeyAndInitMinMax(const KeyDescription & new_partition_key)
{
    if (new_partition_key.expression_list_ast->children.empty())
        return;

    checkKeyExpression(*new_partition_key.expression, new_partition_key.sample_block, "Partition", allow_nullable_key);

    /// Add all columns used in the partition key to the min-max index.
    DataTypes minmax_idx_columns_types = getMinMaxColumnsTypes(new_partition_key);

    /// Try to find the date column in columns used by the partition key (a common case).
    /// If there are no - DateTime or DateTime64 would also suffice.

    bool has_date_column = false;
    bool has_datetime_column = false;

    for (size_t i = 0; i < minmax_idx_columns_types.size(); ++i)
    {
        if (isDate(minmax_idx_columns_types[i]))
        {
            if (!has_date_column)
            {
                minmax_idx_date_column_pos = i;
                has_date_column = true;
            }
            else
            {
                /// There is more than one Date column in partition key and we don't know which one to choose.
                minmax_idx_date_column_pos = -1;
            }
        }
    }
    if (!has_date_column)
    {
        for (size_t i = 0; i < minmax_idx_columns_types.size(); ++i)
        {
            if (isDateTime(minmax_idx_columns_types[i])
                || isDateTime64(minmax_idx_columns_types[i])
            )
            {
                if (!has_datetime_column)
                {
                    minmax_idx_time_column_pos = i;
                    has_datetime_column = true;
                }
                else
                {
                    /// There is more than one DateTime column in partition key and we don't know which one to choose.
                    minmax_idx_time_column_pos = -1;
                }
            }
        }
    }
}


void MergeTreeMetaBase::checkTTLExpressions(const StorageInMemoryMetadata & new_metadata, const StorageInMemoryMetadata & old_metadata) const