Removed cached String objects from SQLDate, SQLTime and SQLTimestamp
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Key: DERBY-3173
URL: https://issues.apache.org/jira/browse/DERBY-3173
Project: Derby
Issue Type: Improvement
Components: SQL
Reporter: Daniel John Debrunner
Priority: Minor
These type classes save a copy of the value when it is converted to a String
(e.g. through a ResultSet.getString()). This complicates the code & increases
memory use for little value, in most cases the cached value will never be used.
E.g. for any type of scan the String value will be discarded when moving to the
next row. In most cases applications do not call getString() twice on a column.
The code has some historical basis in the fact that these types used to be
represented by a java.sql.Time/Date/Timestamp object and its conversion to
String was slow. Now the conversion of all these types to a String is simple.
In addition I think the getString() will sometimes return a non-normalized
form, if the value is set by a non-standard format then the cached String is
set to the non-standard format, not the standard format, I believe this is
incorrect.
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