such as pyodbc
2. SQLDescribeCol
3. more DATA-TYPE-convertions in SQLGetData

delete empty title

Update Evaluation-ch.md

Update Queries-ch.md

Update TAOS SQL-ch.md

[TD-1476]<feature>: a demo for calcite

[TD-1489] add concurrent inquiry test case

[TD-1656] <doc>: fix command to detect systemd in documentation.

Release/s103

Update architecture-ch.md

Update cluster-ch.md

Update architecture-ch.md

Minor modifications on multi-tables queries and add LIKE in query sample.

Recover multi grade storage section.

Minor modifications

Minor modifications on multi tables aggregation queries.

Many minor modifications.

Minor modifications

2. fprint error message when SQLxxx failed in tcodbc

[TD-1249]<fix>:memory leak in rpc

Patch/td 1632

2. use install.sh to install odbcinst/odbc record in system
3. add packages (unixodbc/unixodbc-dev) to install in .travis.yml