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From: SophiahHo (@SophiahHo) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: [pgjdbc/pgjdbc] issue #3659: NullPointerException in getTables getMetaData: Off-by-one difference between ResultSetMetaData size and getColumnCount()
Date: Thu, 12 Jun 2025 20:16:05 +0000
Message-ID: <[email protected]> (raw)

**Describe the issue**
NullPointerException due to off-by-one difference between ResultSetMetaData size and getColumnCount() in getTables' getMetaData.

**Driver Version?** 
42.7.7

**Java Version?**
17

**To Reproduce**
Steps to reproduce the behaviour:

```java
        ResultSet rs = connection.getMetaData().getTables(
                "WrongCatalog", // catalog
                null, // schemaPattern
                null, // tableNamePattern
                null // types
        );
        ResultSetMetaData rsmd = rs.getMetaData();
        for (int col = 1; col <= rsmd.getColumnCount(); col++){
            System.out.println(col + ". " + rsmd.getColumnLabel(col));
        }
```

Result:
```
java.lang.NullPointerException: Cannot invoke "org.postgresql.core.Field.getColumnLabel()" because "field" is null
```

**Expected behaviour**
No exception

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  Subject: Re: [pgjdbc/pgjdbc] issue #3659: NullPointerException in getTables getMetaData: Off-by-one difference between ResultSetMetaData size and getColumnCount()
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