nanodbc: wvarchar: make sure to not read past pdata_ end#1012
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Snowflake ODBC driver, via the
SQLDescribeColapi reports SQL_WVARCHAR[255] for theREMARKScolumn of theSQLTablesoutput, and we allocate buffers against this report. However, table comments are actuallyVARCHAR[MAX], and long comments will overflow these buffers.