From c9ac047c146e3b7c60cd090c70b8034192d4f250 Mon Sep 17 00:00:00 2001
From: Patrick Hoefler <61934744+phofl@users.noreply.github.com>
Date: Mon, 6 May 2024 13:12:09 +0200
Subject: [PATCH] BUG: Use large_string in string array consistently

---
 pandas/core/arrays/string_arrow.py | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/pandas/core/arrays/string_arrow.py b/pandas/core/arrays/string_arrow.py
index ec2534ce174ac..4fccf6da8e608 100644
--- a/pandas/core/arrays/string_arrow.py
+++ b/pandas/core/arrays/string_arrow.py
@@ -196,13 +196,13 @@ def _from_sequence(
             na_values = scalars._mask
             result = scalars._data
             result = lib.ensure_string_array(result, copy=copy, convert_na_value=False)
-            return cls(pa.array(result, mask=na_values, type=pa.string()))
+            return cls(pa.array(result, mask=na_values, type=pa.large_string()))
         elif isinstance(scalars, (pa.Array, pa.ChunkedArray)):
-            return cls(pc.cast(scalars, pa.string()))
+            return cls(pc.cast(scalars, pa.large_string()))
 
         # convert non-na-likes to str
         result = lib.ensure_string_array(scalars, copy=copy)
-        return cls(pa.array(result, type=pa.string(), from_pandas=True))
+        return cls(pa.array(result, type=pa.large_string(), from_pandas=True))
 
     @classmethod
     def _from_sequence_of_strings(
@@ -245,7 +245,7 @@ def isin(self, values: ArrayLike) -> npt.NDArray[np.bool_]:
         value_set = [
             pa_scalar.as_py()
             for pa_scalar in [pa.scalar(value, from_pandas=True) for value in values]
-            if pa_scalar.type in (pa.string(), pa.null())
+            if pa_scalar.type in (pa.string(), pa.null(), pa.large_string())
         ]
 
         # short-circuit to return all False array.
@@ -332,7 +332,9 @@ def _str_map(
             result = lib.map_infer_mask(
                 arr, f, mask.view("uint8"), convert=False, na_value=na_value
             )
-            result = pa.array(result, mask=mask, type=pa.string(), from_pandas=True)
+            result = pa.array(
+                result, mask=mask, type=pa.large_string(), from_pandas=True
+            )
             return type(self)(result)
         else:
             # This is when the result type is object. We reach this when
@@ -655,7 +657,9 @@ def _str_map(
             result = lib.map_infer_mask(
                 arr, f, mask.view("uint8"), convert=False, na_value=na_value
             )
-            result = pa.array(result, mask=mask, type=pa.string(), from_pandas=True)
+            result = pa.array(
+                result, mask=mask, type=pa.large_string(), from_pandas=True
+            )
             return type(self)(result)
         else:
             # This is when the result type is object. We reach this when