Fix metadata reflection for DECIMAL columns - with test #88
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lhofhansl
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JDBC describes that COLUMN_SIZE for a DECIMAL type should reflect its total number of digits, whereas DECIMAL_DIGITS describes it numeric scale.
See: https://docs.oracle.com/javase/7/docs/api/java/sql/DatabaseMetaData.html#getColumns(java.lang.String,%20java.lang.String,%20java.lang.String,%20java.lang.String)
This does the right thing for all other types (where numeric_precision is null), except for INTEGER and LONG, where currently in DuckDB this reports 32 and 64, resp, where it should report 10 and 19. That's for another PR, I think.