Support multiple indexes including a nested index and multiple keywords query

For example:

    select TABLE \
       --match_columns "column || nested.column" \
       --query "KERYWORD1 KEYROWRD2"

See the following added tests for details.

  * test/command/suite/select/index/nested/match_columns/last/and.test
  * test/command/suite/select/index/nested/match_columns/middle/and.test