Add test for old bug #7826

tests/queries/0_stateless/02713_array_low_cardinality_string.reference

@@ -0,0 +1,12 @@
+---
+tab	idx	bloom_filter
+---
+Expression ((Projection + Before ORDER BY))
+  Filter (WHERE)
+    ReadFromMergeTree (default.tab)
+    Indexes:
+      Skip
+        Name: idx
+        Description: bloom_filter GRANULARITY 1
+        Parts: 1/1
+        Granules: 1/1

tests/queries/0_stateless/02713_array_low_cardinality_string.sql

@@ -0,0 +1,23 @@
+DROP TABLE IF EXISTS tab;
+
+CREATE TABLE tab
+(
+    foo Array(LowCardinality(String)),
+    INDEX idx foo TYPE bloom_filter
+)
+ENGINE = MergeTree
+PRIMARY KEY tuple();
+
+INSERT INTO tab VALUES (['a', 'b']);
+
+SELECT '---';
+
+SELECT table, name, type
+FROM system.data_skipping_indices
+WHERE table = 'tab';
+
+SELECT '---';
+
+EXPLAIN indexes = 1 SELECT * FROM tab WHERE has(foo, 'b');
+
+DROP TABLE tab;