paimon-prestosql-common/src/main/java/org/apache/paimon/prestosql/PrestoSqlMetadataBase.java [160:167]:
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    public List<SchemaTableName> listTables(ConnectorSession session, Optional<String> schemaName) {
        List<SchemaTableName> tables = new ArrayList<>();
        schemaName
                .map(Collections::singletonList)
                .orElseGet(catalog::listDatabases)
                .forEach(schema -> tables.addAll(listTables(schema)));
        return tables;
    }
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paimon-presto-common/src/main/java/org/apache/paimon/presto/PrestoMetadata.java [210:217]:
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    public List<SchemaTableName> listTables(ConnectorSession session, Optional<String> schemaName) {
        List<SchemaTableName> tables = new ArrayList<>();
        schemaName
                .map(Collections::singletonList)
                .orElseGet(catalog::listDatabases)
                .forEach(schema -> tables.addAll(listTables(schema)));
        return tables;
    }
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