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20200226 Update record

1. Help Documentation update
2. New feature: present a table sequence as a graph (column graph, pie graph or a line graph is supported) in the cellset;
3. Improvement: users can enclose a table name with double quotation marks in SQL+;
4. Improvement: users can set an alias for a field;
5. New feature: use DatabaseMetaData to get table information through esProc JDBC;
6. New Syntax: use T/+BTX/ and T/+CTX/ to represent a bin file and a composite table respectively;
7. New functions: new linear functions - cov(), covm(), det(), dis(), dism(), I(), inverse(), linefit(), mae(), mul(), mse(), polyfit(), transpose()and var();
8. New Yimming external library function: ym_exec( ) - Execute a Python file;
9. New Yimming external library function: ym_predict@m( ) - Perform data scoring with multithreaded processing;
10. New functions for【New SPL-Function Assist Editor】: db.execute(), db.update(), etc.