Queries with comments in PostgreSQL are executed incorrectly

[zaleslaw]

SELECT users.username, posts.content FROM users JOIN posts ON users.id = posts.user_id; -- 5. Select usernames along with their posted content

returns

Multiple ResultSets were returned by the query. org.postgresql.util.PSQLException: Multiple ResultSets were returned by the query. at org.postgresql.jdbc.PgStatement.getSingleResultSet(PgStatement.java:251) at org.postgresql.jdbc.PgStatement.executeQuery(PgStatement.java:243) at org.jetbrains.kotlinx.dataframe.io.ReadJdbcKt.readSqlQuery(readJdbc.kt:191) at org.jetbrains.kotlinx.dataframe.io.ReadJdbcKt.readSqlQuery(readJdbc.kt:140)