Improve support of ARRAY and SQLXML in JDBC layer

Do not quote other lower case characters

Use token type in Parser instead of string comparisons

Minor memory leak

Reduce code duplication in Parser

comments and formatting

fix for #1265

Eliminate commit of empty batch in some tests

drop TableView isPersistent field

seems like it was a temporary thing while the CTE situation was being worked out

for consistency

it is redundant, we already have the isTemporary field in a superclass

Add INFORMATION_SCHEMA.COLUMNS.DATETIME_PRECISION