cayenne-dbsync/src/main/java/org/apache/cayenne/dbsync/merge/factory/HSQLMergerTokenFactory.java [55:67]:
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    public MergerToken createSetAllowNullToDb(DbEntity entity, DbAttribute column) {
        return new SetAllowNullToDb(entity, column) {

            @Override
            public List<String> createSql(DbAdapter adapter) {
                QuotingStrategy context = adapter.getQuotingStrategy();

                return Collections.singletonList("ALTER TABLE " + context.quotedFullyQualifiedName(getEntity())
                        + " ALTER COLUMN " + context.quotedName(getColumn()) + " SET NULL");
            }

        };
    }
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cayenne-dbsync/src/main/java/org/apache/cayenne/dbsync/merge/factory/DerbyMergerTokenFactory.java [72:84]:
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    public MergerToken createSetAllowNullToDb(DbEntity entity, DbAttribute column) {
        return new SetAllowNullToDb(entity, column) {

            @Override
            public List<String> createSql(DbAdapter adapter) {
                QuotingStrategy context = adapter.getQuotingStrategy();

                return Collections.singletonList("ALTER TABLE " + context.quotedFullyQualifiedName(getEntity())
                        + " ALTER COLUMN " + context.quotedName(getColumn()) + " NULL");
            }

        };
    }
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