wenhuitang opened a new pull request #1861: [CALCITE-3468] JDBC adapter may 
generate casts on Oracle for varchar without the precision and for char with 
the precision exceeding max length of Oracle
URL: https://github.com/apache/calcite/pull/1861
 
 
   Oracle requires VARCHAR with precision, and the max precision of VARCHAR is 
4000, the max precision of CHAR is 2000. When the precision of CHAR is not 
assigned,  it has the default value 1 which is the same as Calcite.

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