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Fix mode.

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This commit is contained in:
Nuno Cruces
2025-07-17 00:50:39 +01:00
parent b0f8ff44a5
commit b21c69dc1f
2 changed files with 43 additions and 18 deletions
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45
ext/stats/mode.go
View File

@@ -19,8 +19,8 @@ type mode struct {
func (m mode) Value(ctx sqlite3.Context) {
var (
max = 0
typ = sqlite3.NULL
max uint
i64 int64
f64 float64
str string
@@ -32,7 +32,6 @@ func (m mode) Value(ctx sqlite3.Context) {
i64 = k
}
}
f64 = float64(i64)
for k, v := range m.reals {
if v > max || v == max && k < f64 {
typ = sqlite3.FLOAT
@@ -66,33 +65,45 @@ func (m mode) Value(ctx sqlite3.Context) {
}
}
func (b *mode) Step(ctx sqlite3.Context, arg ...sqlite3.Value) {
func (m *mode) Step(ctx sqlite3.Context, arg ...sqlite3.Value) {
switch arg[0].Type() {
case sqlite3.INTEGER:
b.ints.add(arg[0].Int64())
if m.reals == nil {
m.ints.add(arg[0].Int64())
break
}
fallthrough
case sqlite3.FLOAT:
b.reals.add(arg[0].Float())
m.reals.add(arg[0].Float())
for k, v := range m.ints {
m.reals[float64(k)] += v
}
m.ints = nil
case sqlite3.TEXT:
b.texts.add(arg[0].Text())
m.texts.add(arg[0].Text())
case sqlite3.BLOB:
b.blobs.add(string(arg[0].RawBlob()))
m.blobs.add(string(arg[0].RawBlob()))
}
}
func (b *mode) Inverse(ctx sqlite3.Context, arg ...sqlite3.Value) {
func (m *mode) Inverse(ctx sqlite3.Context, arg ...sqlite3.Value) {
switch arg[0].Type() {
case sqlite3.INTEGER:
b.ints.del(arg[0].Int64())
if m.reals == nil {
m.ints.del(arg[0].Int64())
break
}
fallthrough
case sqlite3.FLOAT:
b.reals.del(arg[0].Float())
m.reals.del(arg[0].Float())
case sqlite3.TEXT:
b.texts.del(arg[0].Text())
m.texts.del(arg[0].Text())
case sqlite3.BLOB:
b.blobs.del(string(arg[0].RawBlob()))
m.blobs.del(string(arg[0].RawBlob()))
}
}
type counter[T comparable] map[T]int
type counter[T comparable] map[T]uint
func (c *counter[T]) add(k T) {
if (*c) == nil {
@@ -102,11 +113,9 @@ func (c *counter[T]) add(k T) {
}
func (c counter[T]) del(k T) {
switch n := c[k]; n {
default:
c[k] = n - 1
case 1:
if n := c[k]; n == 1 {
delete(c, k)
case 0:
} else {
c[k] = n - 1
}
}

16
ext/stats/mode_test.go
View File

@@ -82,4 +82,20 @@ func TestRegister_mode(t *testing.T) {
for stmt.Step() {
}
stmt.Close()
stmt, _, err = db.Prepare(`SELECT mode(column1) FROM (VALUES (?), (?), (?), (?), (?))`)
if err != nil {
t.Fatal(err)
}
stmt.BindInt(1, 1)
stmt.BindInt(2, 1)
stmt.BindInt(3, 2)
stmt.BindFloat(4, 2)
stmt.BindFloat(5, 2)
if stmt.Step() {
if got := stmt.ColumnInt(0); got != 2 {
t.Errorf("got %v, want 2", got)
}
}
stmt.Close()
}