PostGIS columns created using a specific entity type or a Spatial Reference System Identifier (SRID) constraint, displays as two tables in ArcCatalog if the database is not enabled as a geodatabase.
This issue is no longer reproducible with ArcGIS 10.5.
解决办法
Alter the table <table_name> Alter the column <geometry_column> Type geometry; --Please replace with spatial table name and the spatial geometry_column.