Log sampled records from batch when there are data related errors

[srikanthccv]

ClickHouse rejects certain kinds of inserts, especially for invalid data. For instance, a batch can be rejected for having timestamps that could create too many partitions. It would help to see the sampled data from the batch to what data is getting rejected.

Too many partitions for single INSERT block (more than 100). The limit is controlled by 'max_partitions_per_insert_block' setting. Large number of partitions is a common misconception. It will lead to severe negative performance impact, including slow server startup, slow INSERT queries and slow SELECT queries. Recommended total number of partitions for a table is under 1000..10000. Please note, that partitioning is not intended to speed up SELECT queries (ORDER BY key is sufficient to make range queries fast). Partitions are intended for data manipulation (DROP PARTITION, etc).

This applies for all signals.