add basic tests for the supported types

Makefile

@@ -14,7 +14,8 @@ SRCS = src/quack_heap_seq_scan.cpp \
 
 OBJS = $(subst .cpp,.o, $(SRCS))
 
-REGRESS = basic
+REGRESS =	basic \
+			type_support
 
 PG_CONFIG ?= pg_config
 

expected/type_support.out

@@ -0,0 +1,95 @@
+-- CHAR
+CREATE TABLE chr(a CHAR);
+INSERT INTO chr SELECT CAST(a AS CHAR) from (VALUES (-128), (0), (127)) t(a);
+SELECT * FROM chr;
+ a 
+---
+ -
+ 0
+ 1
+(3 rows)
+
+-- SMALLINT
+CREATE TABLE small(a SMALLINT);
+INSERT INTO small SELECT CAST(a AS SMALLINT) from (VALUES (-32768), (0), (32767)) t(a);
+SELECT * FROM small;
+   a    
+--------
+ -32768
+      0
+  32767
+(3 rows)
+
+-- INTEGER
+CREATE TABLE intgr(a INTEGER);
+INSERT INTO intgr SELECT CAST(a AS INTEGER) from (VALUES (-2147483648), (0), (2147483647)) t(a);
+SELECT * FROM intgr;
+      a      
+-------------
+ -2147483648
+           0
+  2147483647
+(3 rows)
+
+-- BIGINT
+CREATE TABLE big(a BIGINT);
+INSERT INTO big SELECT CAST(a AS BIGINT) from (VALUES (-9223372036854775808), (0), (9223372036854775807)) t(a);
+SELECT * FROM big;
+          a           
+----------------------
+ -9223372036854775808
+                    0
+  9223372036854775807
+(3 rows)
+
+--- BOOL
+CREATE TABLE bool_tbl(a BOOL);
+INSERT INTO bool_tbl SELECT CAST(a AS BOOL) from (VALUES (False), (NULL), (True)) t(a);
+SELECT * FROM bool_tbl;
+ a 
+---
+ f
+
+ t
+(3 rows)
+
+--- VARCHAR
+CREATE TABLE varchar_tbl(a VARCHAR);
+INSERT INTO varchar_tbl SELECT CAST(a AS VARCHAR) from (VALUES (''), (NULL), ('test'), ('this is a long string')) t(a);
+SELECT * FROM varchar_tbl;
+           a           
+-----------------------
+
+
+ test
+ this is a long string
+(4 rows)
+
+-- DATE
+CREATE TABLE date_tbl(a DATE);
+INSERT INTO date_tbl SELECT CAST(a AS DATE) FROM (VALUES ('2022-04-29'::DATE), (NULL), ('2023-05-15'::DATE)) t(a);
+SELECT * FROM date_tbl;
+     a      
+------------
+ 04-29-2022
+
+ 05-15-2023
+(3 rows)
+
+-- TIMESTAMP
+CREATE TABLE timestamp_tbl(a TIMESTAMP);
+INSERT INTO timestamp_tbl SELECT CAST(a AS TIMESTAMP) FROM (VALUES ('2022-04-29 10:15:30'::TIMESTAMP), (NULL), ('2023-05-15 12:30:45'::TIMESTAMP)) t(a);
+SELECT * FROM timestamp_tbl;
+            a             
+--------------------------
+ Fri Apr 29 10:15:30 2022
+
+ Mon May 15 12:30:45 2023
+(3 rows)
+
+DROP TABLE small;
+DROP TABLE intgr;
+DROP TABLE big;
+DROP TABLE varchar_tbl;
+DROP TABLE date_tbl;
+DROP TABLE timestamp_tbl;

sql/type_support.sql

@@ -0,0 +1,47 @@
+
+-- CHAR
+CREATE TABLE chr(a CHAR);
+INSERT INTO chr SELECT CAST(a AS CHAR) from (VALUES (-128), (0), (127)) t(a);
+SELECT * FROM chr;
+
+-- SMALLINT
+CREATE TABLE small(a SMALLINT);
+INSERT INTO small SELECT CAST(a AS SMALLINT) from (VALUES (-32768), (0), (32767)) t(a);
+SELECT * FROM small;
+
+-- INTEGER
+CREATE TABLE intgr(a INTEGER);
+INSERT INTO intgr SELECT CAST(a AS INTEGER) from (VALUES (-2147483648), (0), (2147483647)) t(a);
+SELECT * FROM intgr;
+
+-- BIGINT
+CREATE TABLE big(a BIGINT);
+INSERT INTO big SELECT CAST(a AS BIGINT) from (VALUES (-9223372036854775808), (0), (9223372036854775807)) t(a);
+SELECT * FROM big;
+
+--- BOOL
+CREATE TABLE bool_tbl(a BOOL);
+INSERT INTO bool_tbl SELECT CAST(a AS BOOL) from (VALUES (False), (NULL), (True)) t(a);
+SELECT * FROM bool_tbl;
+
+--- VARCHAR
+CREATE TABLE varchar_tbl(a VARCHAR);
+INSERT INTO varchar_tbl SELECT CAST(a AS VARCHAR) from (VALUES (''), (NULL), ('test'), ('this is a long string')) t(a);
+SELECT * FROM varchar_tbl;
+
+-- DATE
+CREATE TABLE date_tbl(a DATE);
+INSERT INTO date_tbl SELECT CAST(a AS DATE) FROM (VALUES ('2022-04-29'::DATE), (NULL), ('2023-05-15'::DATE)) t(a);
+SELECT * FROM date_tbl;
+
+-- TIMESTAMP
+CREATE TABLE timestamp_tbl(a TIMESTAMP);
+INSERT INTO timestamp_tbl SELECT CAST(a AS TIMESTAMP) FROM (VALUES ('2022-04-29 10:15:30'::TIMESTAMP), (NULL), ('2023-05-15 12:30:45'::TIMESTAMP)) t(a);
+SELECT * FROM timestamp_tbl;
+
+DROP TABLE small;
+DROP TABLE intgr;
+DROP TABLE big;
+DROP TABLE varchar_tbl;
+DROP TABLE date_tbl;
+DROP TABLE timestamp_tbl;