github.com/cockroachdb/cockroach/pkg/ccl/importccl: _null_and_\N_with_escape failed under stress

[cockroach-teamcity]

SHA: https://github.com/cockroachdb/cockroach/commits/d8a546b1ef87a5c6c34e4dfd8155df27e5152d2d

Parameters:

TAGS=
GOFLAGS=

Failed test: https://teamcity.cockroachdb.com/viewLog.html?buildId=778644&tab=buildLog

=== RUN   TestImportData/MYSQLOUTFILE:_null_and_\N_with_escape
I180715 05:17:40.072248 643 sql/lease.go:312  [n1,client=127.0.0.1:41772,user=root] publish: descID=65 (t) version=2 mtime=2018-07-15 05:17:40.07099296 +0000 UTC
I180715 05:17:40.080935 643 sql/event_log.go:126  [n1,client=127.0.0.1:41772,user=root] Event: "drop_table", target: 65, info: {TableName:d.public.t Statement:DROP TABLE IF EXISTS d.public.t, t User:root CascadeDroppedViews:[]}
I180715 05:17:40.080955 643 sql/event_log.go:126  [n1,client=127.0.0.1:41772,user=root] Event: "drop_table", target: 65, info: {TableName:d.public.t Statement:DROP TABLE IF EXISTS d.public.t, t User:root CascadeDroppedViews:[]}
I180715 05:17:40.082337 1868 storage/replica_command.go:279  [split,n1,s1,r36/1:/Table/6{4-6}] initiating a split of this range at key /Table/65 [r38]
I180715 05:17:40.089752 643 sql/lease.go:312  [n1,client=127.0.0.1:41772,user=root,scExec=] publish: descID=65 (t) version=2 mtime=2018-07-15 05:17:40.089602478 +0000 UTC
I180715 05:17:40.120989 1985 ccl/importccl/read_import_proc.go:82  [import-distsql,n1] could not fetch file size; falling back to per-file progress: bad ContentLength: -1
I180715 05:17:40.133596 2020 ccl/importccl/read_import_proc.go:82  [import-distsql,n1] could not fetch file size; falling back to per-file progress: bad ContentLength: -1
I180715 05:17:40.138967 2031 storage/replica_command.go:279  [n1,s1,r37/1:/{Table/66-Max}] initiating a split of this range at key /Table/67 [r39]

[benesch]

#27498