This CL mainly changes:
Support specifying csv schema manually in s3/hdfs table valued function
s3 (
'URI' = 'https://bucket1/inventory.dat',
'ACCESS_KEY'= 'ak',
'SECRET_KEY' = 'sk',
'FORMAT' = 'csv',
'column_separator' = '|',
'csv_schema' = 'k1:int;k2:int;k3:int;k4:decimal(38,10)',
'use_path_style'='true'
)
Add new session variable dry_run_query
If set to true, the real query result will not be returned, instead, it will only return the number of returned rows.
mysql> select * from bigtable;
+--------------+
| ReturnedRows |
+--------------+
| 10000000 |
+--------------+
This can avoid large result set transmission time and focus on real execution time of query engine.
For debug and analysis purpose.
39f59f554a