From d7a1f4ed2ac385a6eeae582e4631f0c9f507260b Mon Sep 17 00:00:00 2001
From: Yongting You <2010youy01@gmail.com>
Date: Mon, 20 Jul 2026 14:57:24 +0800
Subject: [PATCH] iszero tests

---
 datafusion/sqllogictest/test_files/math.slt | 80 +++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/datafusion/sqllogictest/test_files/math.slt b/datafusion/sqllogictest/test_files/math.slt
index 583d6f6777865..7c2449623090f 100644
--- a/datafusion/sqllogictest/test_files/math.slt
+++ b/datafusion/sqllogictest/test_files/math.slt
@@ -149,6 +149,86 @@ SELECT iszero(1::DECIMAL(10,2)), iszero(0::DECIMAL(10,2)), iszero(NULL::DECIMAL(
 ----
 false true NULL false
 
+# iszero: scalar boundary values at the remaining numeric widths
+query BBBBBBBBBB
+SELECT
+    iszero(arrow_cast(-0.0, 'Float16')),
+    iszero(arrow_cast('NaN', 'Float32')),
+    iszero(arrow_cast('-128', 'Int8')),
+    iszero(arrow_cast('-32768', 'Int16')),
+    iszero(arrow_cast('-9223372036854775808', 'Int64')),
+    iszero(arrow_cast('65535', 'UInt16')),
+    iszero(arrow_cast('18446744073709551615', 'UInt64')),
+    iszero(arrow_cast('0.00', 'Decimal32(7,2)')),
+    iszero(arrow_cast('-12.34', 'Decimal64(16,2)')),
+    iszero(arrow_cast('0.00', 'Decimal256(40,2)'))
+----
+true false false false false false false true false true
+
+# iszero: signed integer arrays, including minimum values and nulls
+query IBBBB
+SELECT id, iszero(i8), iszero(i16), iszero(i32), iszero(i64)
+FROM (VALUES
+    (1, 0::TINYINT, 0::SMALLINT, 0::INT, 0::BIGINT),
+    (2, arrow_cast('-128', 'Int8'), arrow_cast('-32768', 'Int16'), arrow_cast('-2147483648', 'Int32'), arrow_cast('-9223372036854775808', 'Int64')),
+    (3, NULL::TINYINT, NULL::SMALLINT, NULL::INT, NULL::BIGINT)
+) AS t(id, i8, i16, i32, i64)
+ORDER BY id
+----
+1 true true true true
+2 false false false false
+3 NULL NULL NULL NULL
+
+# iszero: unsigned integer arrays
+query IBBBB
+SELECT id, iszero(u8), iszero(u16), iszero(u32), iszero(u64)
+FROM (VALUES
+    (1, 0::TINYINT UNSIGNED, 0::SMALLINT UNSIGNED, 0::INT UNSIGNED, 0::BIGINT UNSIGNED),
+    (2, 255::TINYINT UNSIGNED, 65535::SMALLINT UNSIGNED, 4294967295::INT UNSIGNED, 4294967295::BIGINT UNSIGNED),
+    (3, NULL::TINYINT UNSIGNED, NULL::SMALLINT UNSIGNED, NULL::INT UNSIGNED, NULL::BIGINT UNSIGNED)
+) AS t(id, u8, u16, u32, u64)
+ORDER BY id
+----
+1 true true true true
+2 false false false false
+3 NULL NULL NULL NULL
+
+# iszero: floating-point arrays, including signed zero, NaN, and nulls
+query IBBB
+SELECT id,
+    iszero(arrow_cast(v, 'Float16')),
+    iszero(arrow_cast(v, 'Float32')),
+    iszero(arrow_cast(v, 'Float64'))
+FROM (VALUES (1, 0.0), (2, -0.0), (3, 'NaN'::DOUBLE), (4, -1.5), (5, NULL::DOUBLE)) AS t(id, v)
+ORDER BY id
+----
+1 true true true
+2 true true true
+3 false false false
+4 false false false
+5 NULL NULL NULL
+
+# iszero: decimal arrays at every Arrow decimal width
+query IBBBB
+SELECT id,
+    iszero(arrow_cast(v, 'Decimal32(7,2)')),
+    iszero(arrow_cast(v, 'Decimal64(16,2)')),
+    iszero(arrow_cast(v, 'Decimal128(30,2)')),
+    iszero(arrow_cast(v, 'Decimal256(40,2)'))
+FROM (VALUES (1, '0.00'), (2, '-12.34'), (3, NULL)) AS t(id, v)
+ORDER BY id
+----
+1 true true true true
+2 false false false false
+3 NULL NULL NULL NULL
+
+# iszero: an untyped all-null array
+query B
+SELECT iszero(v) FROM (VALUES (NULL), (NULL)) AS t(v)
+----
+NULL
+NULL
+
 # abs: empty argument
 statement error
 SELECT abs();