[metastore] Sample more rows for more precise types in create table from a file

• Download all_month.csv from this JIRA
• Go to the Metastore Manager
• Click the default database
• Click create table from file
• Name table and open Input File or Directory (...)
• Upload all_month.csv, select file
• Click Next
• Click Next
• Deselect, Use first row as column names
• Click Create Table
• Go to Impala and Perform incremental metadata update

Compare column col_17 (magError) with column col_15 (horizontalError). magError is set to string while horizontalError is set to float. If you look at the csv file itself, you can see that magError has a NULL in its first row while horizontalError does not.

In 3.11, you see this same behavior when you create the table with column names. In 3.10, you only saw this behavior when you created with column names. When you removed column names, magError was also set to float.