diff --git a/pkg/sql/colexec/execgen/cmd/execgen/select_in_gen.go b/pkg/sql/colexec/execgen/cmd/execgen/select_in_gen.go
index d62bfe94bee9..772b6278f514 100644
--- a/pkg/sql/colexec/execgen/cmd/execgen/select_in_gen.go
+++ b/pkg/sql/colexec/execgen/cmd/execgen/select_in_gen.go
@@ -25,6 +25,7 @@ func genSelectIn(inputFileContents string, wr io.Writer) error {
 		"_CANONICAL_TYPE_FAMILY", "{{.CanonicalTypeFamilyStr}}",
 		"_TYPE_WIDTH", typeWidthReplacement,
 		"_GOTYPESLICE", "{{.GoTypeSliceName}}",
+		"_GOTYPE_UPCAST_INT", `{{if or (eq .VecMethod "Int16") (eq .VecMethod "Int32")}}int64{{else}}{{.GoType}}{{end}}`,
 		"_GOTYPE", "{{.GoType}}",
 		"_TYPE", "{{.VecMethod}}",
 		"TemplateType", "{{.VecMethod}}",
diff --git a/pkg/sql/colexec/select_in.eg.go b/pkg/sql/colexec/select_in.eg.go
index 820174e75bbd..0890c24ec39f 100644
--- a/pkg/sql/colexec/select_in.eg.go
+++ b/pkg/sql/colexec/select_in.eg.go
@@ -1039,7 +1039,7 @@ func (pi *projectInOpDecimal) Next() coldata.Batch {
 
 type selectInOpInt16 struct {
 	colexecop.OneInputHelper
-	filterRow []int16
+	filterRow []int64
 	colIdx    int
 	hasNulls  bool
 	negate    bool
@@ -1050,7 +1050,7 @@ var _ colexecop.Operator = &selectInOpInt16{}
 type projectInOpInt16 struct {
 	colexecop.OneInputHelper
 	allocator *colmem.Allocator
-	filterRow []int16
+	filterRow []int64
 	colIdx    int
 	outputIdx int
 	hasNulls  bool
@@ -1061,19 +1061,20 @@ var _ colexecop.Operator = &projectInOpInt16{}
 
 func fillDatumRowInt16(
 	evalCtx *eval.Context, t *types.T, datumTuple *tree.DTuple,
-) ([]int16, bool) {
+) ([]int64, bool) {
 	// Sort the contents of the tuple, if they are not already sorted.
 	datumTuple.Normalize(evalCtx)
 
-	conv := colconv.GetDatumToPhysicalFn(t)
-	var result []int16
+	// Ensure that we always upcast all integer types.
+	conv := colconv.GetDatumToPhysicalFn(types.Int)
+	var result []int64
 	hasNulls := false
 	for _, d := range datumTuple.D {
 		if d == tree.DNull {
 			hasNulls = true
 		} else {
 			convRaw := conv(d)
-			converted := convRaw.(int16)
+			converted := convRaw.(int64)
 			result = append(result, converted)
 		}
 	}
@@ -1081,7 +1082,7 @@ func fillDatumRowInt16(
 }
 
 func cmpInInt16(
-	targetElem int16, targetCol coldata.Int16s, filterRow []int16, hasNulls bool,
+	targetElem int16, targetCol coldata.Int16s, filterRow []int64, hasNulls bool,
 ) comparisonResult {
 	// Filter row input was already sorted in fillDatumRowInt16, so we can
 	// perform a binary search.
@@ -1276,7 +1277,7 @@ func (pi *projectInOpInt16) Next() coldata.Batch {
 
 type selectInOpInt32 struct {
 	colexecop.OneInputHelper
-	filterRow []int32
+	filterRow []int64
 	colIdx    int
 	hasNulls  bool
 	negate    bool
@@ -1287,7 +1288,7 @@ var _ colexecop.Operator = &selectInOpInt32{}
 type projectInOpInt32 struct {
 	colexecop.OneInputHelper
 	allocator *colmem.Allocator
-	filterRow []int32
+	filterRow []int64
 	colIdx    int
 	outputIdx int
 	hasNulls  bool
@@ -1298,19 +1299,20 @@ var _ colexecop.Operator = &projectInOpInt32{}
 
 func fillDatumRowInt32(
 	evalCtx *eval.Context, t *types.T, datumTuple *tree.DTuple,
-) ([]int32, bool) {
+) ([]int64, bool) {
 	// Sort the contents of the tuple, if they are not already sorted.
 	datumTuple.Normalize(evalCtx)
 
-	conv := colconv.GetDatumToPhysicalFn(t)
-	var result []int32
+	// Ensure that we always upcast all integer types.
+	conv := colconv.GetDatumToPhysicalFn(types.Int)
+	var result []int64
 	hasNulls := false
 	for _, d := range datumTuple.D {
 		if d == tree.DNull {
 			hasNulls = true
 		} else {
 			convRaw := conv(d)
-			converted := convRaw.(int32)
+			converted := convRaw.(int64)
 			result = append(result, converted)
 		}
 	}
@@ -1318,7 +1320,7 @@ func fillDatumRowInt32(
 }
 
 func cmpInInt32(
-	targetElem int32, targetCol coldata.Int32s, filterRow []int32, hasNulls bool,
+	targetElem int32, targetCol coldata.Int32s, filterRow []int64, hasNulls bool,
 ) comparisonResult {
 	// Filter row input was already sorted in fillDatumRowInt32, so we can
 	// perform a binary search.
diff --git a/pkg/sql/colexec/select_in_tmpl.go b/pkg/sql/colexec/select_in_tmpl.go
index a4de8383b601..10d564fa4ae4 100644
--- a/pkg/sql/colexec/select_in_tmpl.go
+++ b/pkg/sql/colexec/select_in_tmpl.go
@@ -56,6 +56,7 @@ var (
 // {{/*
 
 type _GOTYPESLICE interface{}
+type _GOTYPE_UPCAST_INT interface{}
 type _GOTYPE interface{}
 type _TYPE interface{}
 
@@ -146,7 +147,7 @@ func GetInOperator(
 
 type selectInOp_TYPE struct {
 	colexecop.OneInputHelper
-	filterRow []_GOTYPE
+	filterRow []_GOTYPE_UPCAST_INT
 	colIdx    int
 	hasNulls  bool
 	negate    bool
@@ -157,7 +158,7 @@ var _ colexecop.Operator = &selectInOp_TYPE{}
 type projectInOp_TYPE struct {
 	colexecop.OneInputHelper
 	allocator *colmem.Allocator
-	filterRow []_GOTYPE
+	filterRow []_GOTYPE_UPCAST_INT
 	colIdx    int
 	outputIdx int
 	hasNulls  bool
@@ -168,19 +169,24 @@ var _ colexecop.Operator = &projectInOp_TYPE{}
 
 func fillDatumRow_TYPE(
 	evalCtx *eval.Context, t *types.T, datumTuple *tree.DTuple,
-) ([]_GOTYPE, bool) {
+) ([]_GOTYPE_UPCAST_INT, bool) {
 	// Sort the contents of the tuple, if they are not already sorted.
 	datumTuple.Normalize(evalCtx)
 
+	// {{if or (eq .VecMethod "Int16") (eq .VecMethod "Int32")}}
+	// Ensure that we always upcast all integer types.
+	conv := colconv.GetDatumToPhysicalFn(types.Int)
+	//{{else}}
 	conv := colconv.GetDatumToPhysicalFn(t)
-	var result []_GOTYPE
+	// {{end}}
+	var result []_GOTYPE_UPCAST_INT
 	hasNulls := false
 	for _, d := range datumTuple.D {
 		if d == tree.DNull {
 			hasNulls = true
 		} else {
 			convRaw := conv(d)
-			converted := convRaw.(_GOTYPE)
+			converted := convRaw.(_GOTYPE_UPCAST_INT)
 			result = append(result, converted)
 		}
 	}
@@ -188,7 +194,7 @@ func fillDatumRow_TYPE(
 }
 
 func cmpIn_TYPE(
-	targetElem _GOTYPE, targetCol _GOTYPESLICE, filterRow []_GOTYPE, hasNulls bool,
+	targetElem _GOTYPE, targetCol _GOTYPESLICE, filterRow []_GOTYPE_UPCAST_INT, hasNulls bool,
 ) comparisonResult {
 	// Filter row input was already sorted in fillDatumRow_TYPE, so we can
 	// perform a binary search.
diff --git a/pkg/sql/logictest/testdata/logic_test/select b/pkg/sql/logictest/testdata/logic_test/select
index 0af830569895..6599db308afb 100644
--- a/pkg/sql/logictest/testdata/logic_test/select
+++ b/pkg/sql/logictest/testdata/logic_test/select
@@ -938,3 +938,14 @@ ORDER BY 1 DESC
 ----
 5ebfedee-0dcf-41e6-a315-5fa0b51b9883  2  1999-11-30 23:59:58 +0000 +0000
 5ebfedee-0dcf-41e6-a315-5fa0b51b9882  1  1999-11-30 23:59:59 +0000 +0000
+
+# Regression test for incorrect evaluation of the IN filter due to integer
+# overflow when working with INT4 type (#102864).
+statement ok
+CREATE TABLE t102864 (c INT4);
+INSERT INTO t102864 (c) VALUES (0);
+
+query I
+SELECT c FROM t102864 WHERE c IN (0, 862827606027206657::INT8);
+----
+0