StringBuilder sqlBuffer = new StringBuilder();
QuotingStrategy context = adapter.getQuotingStrategy(getEntity()
.getDataMap()
.isQuotingSQLIdentifiers());
sqlBuffer.append("ALTER TABLE ");
sqlBuffer.append(context.quoteFullyQualifiedName(getEntity()));
sqlBuffer.append(" ALTER COLUMN ");
sqlBuffer.append(context.quoteString(getColumn().getName()));
sqlBuffer.append(" DROP NOT NULL");
return Collections.singletonList(sqlBuffer.toString());