bug: Unable to cache table after creating geometry column

[jstammers]

What happened?

I'm trying to create a table with a geometry column using given lat/long coodinates.

I can successfully create this column, but when calling .cache(), I get a ParserError.

Here's an example that replicates it

 from ibis.interactive import *
 t = ibis.examples.zones.fetch()
 t = t.mutate(geom=_.x_cent.point(_.y_cent)).cache()

I don't see this behaviour when I do the following

 t = ibis.examples.zones.fetch()
 t = t.cache() #geom already exists in the zones table

The only material difference in the SQL in each case is the use of ST_POINT when creating the geometry

SELECT
  *
  REPLACE (ST_ASWKB("geom") AS "geom")
FROM (
  SELECT
    "t0"."OBJECTID",
    "t0"."Shape_Leng",
    "t0"."Shape_Area",
    "t0"."zone",
    "t0"."LocationID",
    "t0"."borough",
    "t0"."x_cent",
    "t0"."y_cent",
    ST_POINT("t0"."x_cent", "t0"."y_cent") AS "geom"
  FROM "ibis_read_geo_xqclf77uwbhqzmcrvtctt27c34" AS "t0"
)

SELECT
  *
  REPLACE (ST_ASWKB("geom") AS "geom")
FROM (
  SELECT
    *
  FROM "ibis_read_geo_qwgreoxngfbmjdveyqna5ldkfy"
)

What version of ibis are you using?

9.5.0

What backend(s) are you using, if any?

DuckDB

Relevant log output

ParserException: Parser Error: Expected a constant as type modifier
File <command-2809322511957941>, line 2
      1 t = ibis.examples.zones.fetch()
----> 2 t = t.mutate(geom=_.x_cent.point(_.y_cent)).cache()

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