From b3bbde12ed67fcbbfd809b043b5bc819f13bfa51 Mon Sep 17 00:00:00 2001
From: Phillip Cloud <417981+cpcloud@users.noreply.github.com>
Date: Mon, 22 Apr 2024 07:28:51 -0400
Subject: [PATCH] fix(polars): ensure that reading from a compressed csv
 triggers in-memory read

---
 ibis/backends/polars/__init__.py | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/ibis/backends/polars/__init__.py b/ibis/backends/polars/__init__.py
index a09c8c0ff0fb..f2e4ffa24bed 100644
--- a/ibis/backends/polars/__init__.py
+++ b/ibis/backends/polars/__init__.py
@@ -183,10 +183,15 @@ def read_csv(
         path = normalize_filename(path)
         table_name = table_name or gen_name("read_csv")
         try:
-            self._add_table(table_name, pl.scan_csv(path, **kwargs))
+            table = pl.scan_csv(path, **kwargs)
+            # triggers a schema computation to handle compressed csv inference
+            # and raise a compute error
+            table.schema  # noqa: B018
         except pl.exceptions.ComputeError:
             # handles compressed csvs
-            self._add_table(table_name, pl.read_csv(path, **kwargs))
+            table = pl.read_csv(path, **kwargs)
+
+        self._add_table(table_name, table)
         return self.table(table_name)
 
     def read_json(