fix: identifiers casing

Makefile

@@ -30,3 +30,11 @@ tidy:
 	go mod tidy
 	cd sqltests && go mod tidy && cd ..
 	cd cmd/chai && go mod tidy && cd ../..
+
+pg:
+	docker run -d --name chai-pg \
+		-e POSTGRES_USER=postgres \
+		-e POSTGRES_PASSWORD=postgres \
+		-e POSTGRES_DB=postgres \
+		-p 5432:5432 \
+		postgres:latest

internal/database/catalog.go

@@ -2,6 +2,7 @@ package database
 
 import (
 	"fmt"
+	"maps"
 	"math"
 	"sort"
 	"strings"
@@ -609,35 +610,34 @@ func newCatalogCache() *catalogCache {
 
 func (c *catalogCache) Load(tables []TableInfo, indexes []IndexInfo, sequences []Sequence) {
 	for i := range tables {
-		c.tables[tables[i].TableName] = &TableInfoRelation{Info: &tables[i]}
+		lc := strings.ToLower(tables[i].TableName)
+		c.tables[lc] = &TableInfoRelation{Info: &tables[i]}
 	}
 
 	for i := range indexes {
-		c.indexes[indexes[i].IndexName] = &IndexInfoRelation{Info: &indexes[i]}
+		lc := strings.ToLower(indexes[i].IndexName)
+		c.indexes[lc] = &IndexInfoRelation{Info: &indexes[i]}
 	}
 
 	for i := range sequences {
-		c.sequences[sequences[i].Info.Name] = &sequences[i]
+		lc := strings.ToLower(sequences[i].Info.Name)
+		c.sequences[lc] = &sequences[i]
 	}
 }
 
 func (c *catalogCache) Clone() *catalogCache {
 	clone := newCatalogCache()
 
-	for k, v := range c.tables {
-		clone.tables[k] = v
-	}
-	for k, v := range c.indexes {
-		clone.indexes[k] = v
-	}
-	for k, v := range c.sequences {
-		clone.sequences[k] = v
-	}
+	maps.Copy(clone.tables, c.tables)
+	maps.Copy(clone.indexes, c.indexes)
+	maps.Copy(clone.sequences, c.sequences)
 
 	return clone
 }
 
 func (c *catalogCache) objectExists(name string) bool {
+	name = strings.ToLower(name)
+
 	// checking if table exists with the same name
 	if _, ok := c.tables[name]; ok {
 		return true
@@ -699,10 +699,11 @@ func (c *catalogCache) Add(tx *Transaction, o Relation) error {
 	}
 
 	m := c.getMapByType(o.Type())
-	m[name] = o
+	lc := strings.ToLower(name)
+	m[lc] = o
 
 	tx.OnRollbackHooks = append(tx.OnRollbackHooks, func() {
-		delete(m, name)
+		delete(m, lc)
 	})
 
 	return nil
@@ -711,15 +712,16 @@ func (c *catalogCache) Add(tx *Transaction, o Relation) error {
 func (c *catalogCache) Replace(tx *Transaction, o Relation) error {
 	m := c.getMapByType(o.Type())
 
-	old, ok := m[o.Name()]
+	name := strings.ToLower(o.Name())
+	old, ok := m[name]
 	if !ok {
 		return errs.NewNotFoundError(o.Name())
 	}
 
-	m[o.Name()] = o
+	m[name] = o
 
 	tx.OnRollbackHooks = append(tx.OnRollbackHooks, func() {
-		m[o.Name()] = old
+		m[name] = old
 	})
 
 	return nil
@@ -728,6 +730,7 @@ func (c *catalogCache) Replace(tx *Transaction, o Relation) error {
 func (c *catalogCache) Delete(tx *Transaction, tp, name string) (Relation, error) {
 	m := c.getMapByType(tp)
 
+	name = strings.ToLower(name)
 	o, ok := m[name]
 	if !ok {
 		return nil, errs.NewNotFoundError(name)
@@ -745,7 +748,8 @@ func (c *catalogCache) Delete(tx *Transaction, tp, name string) (Relation, error
 func (c *catalogCache) Get(tp, name string) (Relation, error) {
 	m := c.getMapByType(tp)
 
-	o, ok := m[name]
+	lc := strings.ToLower(name)
+	o, ok := m[lc]
 	if !ok {
 		return nil, errs.NewNotFoundError(name)
 	}
@@ -757,8 +761,8 @@ func (c *catalogCache) ListObjects(tp string) []string {
 	m := c.getMapByType(tp)
 
 	list := make([]string, 0, len(m))
-	for name := range m {
-		list = append(list, name)
+	for _, r := range m {
+		list = append(list, r.Name())
 	}
 
 	sort.Strings(list)

sqltests/MISC/casing.sql

@@ -0,0 +1,20 @@
+-- test: Identifiers are not case sensitive
+CREATE TABLE Test(pk INT PRIMARY KEY);
+INSERT INTO test (pk) VALUES (1) RETURNING *;
+/* result:
+{"pk": 1}
+*/
+
+-- test: Identifiers are not case sensitive
+CREATE TABLE Test(pk INT PRIMARY KEY);
+INSERT INTO tEst (pk) VALUES (1) RETURNING *;
+/* result:
+{"pk": 1}
+*/
+
+-- test: Identifiers are not case sensitive
+CREATE TABLE TEST(pk INT PRIMARY KEY);
+INSERT INTO test (pk) VALUES (1) RETURNING *;
+/* result:
+{"pk": 1}
+*/