for (int i = rowOffset + _rowLength - 1; rowOffset < i; i--)
buffer[i] = 0;
for (int i = 0; i < columns.size(); i++) {
Column column = columns.get(i);
Expr value = values.get(i);
column.setExpr(xa, buffer, rowOffset, value, queryContext);
}
// lock for insert, i.e. entries, indices, and validation