Experiment with ArrowStream streaming

[nvartolomei]

POC for fixing ArrowStream reading when source is not a local file.

Before:

ninja clickhouse-local && programs/clickhouse-local -q "SELECT count(), min(number), max(number) FROM url('http://127.0.0.1:3000/inf', "ArrowStream", 'number UInt64') FORMAT JSON" --logger.level trace
<Information> executeQuery: Read 100000000 rows, 762.94 MiB in 9.683175 sec., 10327191 rows/sec., 78.79 MiB/sec.
**<Debug> MemoryTracker: Peak memory usage (for query): 2.25 Gi**

After:

<Information> executeQuery: Read 100000000 rows, 762.94 MiB in 6.701079 sec., 14922969 rows/sec., 113.85 MiB/sec.
**<Debug> MemoryTracker: Peak memory usage (for query): 4.59 MiB.**

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Changelog category (leave one):

• Performance Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Improve performance of reading from ArrowStream input format for sources other then local file (e.g. URL).

[KochetovNicolai]

LGTM

[KochetovNicolai]

zless clickhouse-server.log.gz | grep -a Fatal
2021.04.08 01:47:41.131832 [ 295 ] {} <Fatal> Application: Child process was terminated by signal 9 (KILL). If it is not done by 'forcestop' command or manually, the possible cause is OOM Killer (see 'dmesg' and look at the '/var/log/kern.log' for the details).