fix(sqlalchemy): quote struct field names

ibis/backends/base/sql/alchemy/datatypes.py

@@ -47,8 +47,9 @@ def __init__(self, fields: Mapping[str, sat.TypeEngine]) -> None:
 
 @compiles(StructType, "default")
 def compiles_struct(element, compiler, **kw):
+    quote = compiler.dialect.identifier_preparer.quote
     content = ", ".join(
-        f"{field} {compiler.process(typ, **kw)}"
+        f"{quote(field)} {compiler.process(typ, **kw)}"
         for field, typ in element.fields.items()
     )
     return f"STRUCT({content})"

ibis/backends/duckdb/tests/test_datatypes.py

@@ -1,8 +1,11 @@
+import duckdb_engine
 import pytest
+import sqlalchemy as sa
 import sqlglot as sg
 from packaging.version import parse as vparse
 from pytest import param
 
+import ibis.backends.base.sql.alchemy.datatypes as sat
 import ibis.common.exceptions as exc
 import ibis.expr.datatypes as dt
 from ibis.backends.duckdb.datatypes import parse
@@ -119,3 +122,12 @@ def test_parse_quoted_struct_field():
     assert ddt.parse('STRUCT("a" INT, "a b c" INT)') == dt.Struct(
         {"a": dt.int32, "a b c": dt.int32}
     )
+
+
+def test_generate_quoted_struct():
+    typ = sat.StructType(
+        {"in come": sa.TEXT(), "my count": sa.BIGINT(), "thing": sa.INT()}
+    )
+    result = typ.compile(dialect=duckdb_engine.Dialect())
+    expected = 'STRUCT("in come" TEXT, "my count" BIGINT, thing INTEGER)'
+    assert result == expected