Basic understanding of MycatPostgreSQL JDBC driver configurationJava debugging skills
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The issue describes an SQL error when connecting to Mycat via Navicat, with PostgreSQL 42.3.3 driver. To reproduce, set up Mycat 1.6.7.6 with PostgreSQL backend and connect using Navicat. Investigate the error message (likely a schema or query issue). Check Mycat logs and network traffic. Look at Mycat's PostgreSQL protocol handling code, possibly in source files like 'src/main/java/io/mycat/net/PostgreSQLPacket.java' or similar. The maintainers may need to clarify if this is a known incompatibility.