should be it

external/duckdb/test/sql/copy/csv/test_decimal.test

@@ -0,0 +1,77 @@
+# name: test/sql/copy/csv/test_decimal.test
+# description: Test CSVs with a decimal value
+# group: [csv]
+
+statement ok
+PRAGMA enable_verification
+
+
+query I
+FROM 'data/csv/decimal.csv'
+----
+3.521525712040701
+
+query I
+select typeof (col_a) FROM 'data/csv/decimal.csv'
+----
+DOUBLE
+
+# By Default our decimal is (18,3)
+query I
+SELECT * FROM read_csv(
+    'data/csv/decimal.csv',
+    columns = {'col_a': 'DECIMAL'});
+----
+3.522
+
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+    columns = {'col_a': 'DECIMAL'});
+----
+DECIMAL(18,3)
+
+# We can define our decimal as (18,15)
+query I
+SELECT * FROM read_csv(
+    'data/csv/decimal.csv',
+    columns = {'col_a': 'DECIMAL(18,15)'});
+----
+3.521525712040701
+
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+    columns = {'col_a': 'DECIMAL(18,15)'});
+----
+DECIMAL(18,15)
+
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+     auto_type_candidates=['NULL', 'DECIMAL', 'VARCHAR']);
+----
+DECIMAL(18,3)
+
+# If we have multiple decimal values being defined, it defaults to the last one here
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+     auto_type_candidates=['NULL', 'DECIMAL(18,3)','DECIMAL(18,15)', 'VARCHAR']);
+----
+DECIMAL(18,15)
+
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+     auto_type_candidates=['NULL','DECIMAL(18,15)', 'DECIMAL(18,3)', 'VARCHAR']);
+----
+DECIMAL(18,3)
+
+query I
+SELECT typeof(col_a) FROM read_csv(
+    'data/csv/decimal.csv',
+     auto_type_candidates=['NULL', 'DECIMAL(18,15)', 'VARCHAR']);
+----
+DECIMAL(18,15)
+