feat: 新增 BooleanFunctionLookup 支持函数式操作符

- sqlgen: 新增 BooleanFunctionLookup，生成 FUNC(LHS, RHS) 格式，优先级高于 BooleanOperatorLookup
- dialect/duckdb: 使用 regexp_matches 替代 ~ 实现部分匹配，等价于 MySQL REGEXP
- sqlgen/expression_sql_generator_test: 补充 BooleanFunctionLookup 测试用例，修正 encode_error 前缀
- sqlgen/sql_dialect_options_test: 验证 BooleanFunctionLookup 默认为 nil
- dialect/duckdb_test: 新增 regexp_matches SQL 生成测试

sqlgen/expression_sql_generator.go

@@ -386,10 +386,22 @@ func (esg *expressionSQLGenerator) aliasedExpressionSQL(b sb.SQLBuilder, aliased
 
 // Generates SQL for a BooleanExpresion (e.g. I("a").Eq(2) -> "a" = 2)
 func (esg *expressionSQLGenerator) booleanExpressionSQL(b sb.SQLBuilder, operator exp.BooleanExpression) {
+	operatorOp := operator.Op()
+
+	// 函数式操作符：生成 FUNC(LHS, RHS)
+	if fn, ok := esg.dialectOptions.BooleanFunctionLookup[operatorOp]; ok {
+		b.Write(fn)
+		b.WriteRunes(esg.dialectOptions.LeftParenRune)
+		esg.Generate(b, operator.LHS())
+		b.WriteRunes(esg.dialectOptions.CommaRune, esg.dialectOptions.SpaceRune)
+		esg.Generate(b, operator.RHS())
+		b.WriteRunes(esg.dialectOptions.RightParenRune)
+		return
+	}
+
 	b.WriteRunes(esg.dialectOptions.LeftParenRune)
 	esg.Generate(b, operator.LHS())
 	b.WriteRunes(esg.dialectOptions.SpaceRune)
-	operatorOp := operator.Op()
 	if val, ok := esg.dialectOptions.BooleanOperatorLookup[operatorOp]; ok {
 		b.Write(val)
 	} else {

sqlgen/expression_sql_generator_test.go

@@ -127,8 +127,8 @@ func (esgs *expressionSQLGeneratorSuite) TestGenerate_UnsupportedType() {
 	type strct struct{}
 	esgs.assertCases(
 		sqlgen.NewExpressionSQLGenerator("test", sqlgen.DefaultDialectOptions()),
-		expressionTestCase{val: strct{}, err: "dbv2_encode_error: Unable to encode value {}"},
-		expressionTestCase{val: strct{}, err: "dbv2_encode_error: Unable to encode value {}", isPrepared: true},
+		expressionTestCase{val: strct{}, err: "db_encode_error: Unable to encode value {}"},
+		expressionTestCase{val: strct{}, err: "db_encode_error: Unable to encode value {}", isPrepared: true},
 	)
 }
 
@@ -624,6 +624,24 @@ func (esgs *expressionSQLGeneratorSuite) TestGenerate_BooleanExpression() {
 		expressionTestCase{val: ident.NotILike("a%"), err: "db: boolean operator 'notilike' not supported"},
 		expressionTestCase{val: ident.NotILike(re), err: "db: boolean operator 'regexpnotilike' not supported"},
 	)
+
+	// BooleanFunctionLookup 生成 FUNC(LHS, RHS) 格式，优先级高于 BooleanOperatorLookup
+	opts2 := sqlgen.DefaultDialectOptions()
+	opts2.BooleanFunctionLookup = map[exp.BooleanOperation][]byte{
+		exp.RegexpLikeOp:  []byte("regexp_matches"),
+		exp.RegexpILikeOp: []byte("regexp_matches"),
+	}
+	esgs.assertCases(
+		sqlgen.NewExpressionSQLGenerator("test", opts2),
+		// 函数调用格式
+		expressionTestCase{val: ident.Like(re), sql: `regexp_matches("a", '[ab]')`},
+		expressionTestCase{val: ident.Like(re), sql: `regexp_matches("a", ?)`, isPrepared: true, args: []interface{}{"[ab]"}},
+		expressionTestCase{val: ident.ILike(re), sql: `regexp_matches("a", '[ab]')`},
+		expressionTestCase{val: ident.ILike(re), sql: `regexp_matches("a", ?)`, isPrepared: true, args: []interface{}{"[ab]"}},
+		// 未在 BooleanFunctionLookup 中的操作符仍走中缀格式
+		expressionTestCase{val: ident.Eq(1), sql: `("a" = 1)`},
+		expressionTestCase{val: ident.NotLike(re), sql: `("a" !~ '[ab]')`},
+	)
 }
 
 func (esgs *expressionSQLGeneratorSuite) TestGenerate_BitwiseExpression() {

sqlgen/sql_dialect_options.go

@@ -219,6 +219,8 @@ type (
 		// 		exp.RegexpNotILikeOp: []byte("!~*"),
 		// })
 		BooleanOperatorLookup map[exp.BooleanOperation][]byte
+		// 函数式布尔操作符，生成 FUNC(LHS, RHS) 格式，优先级高于 BooleanOperatorLookup
+		BooleanFunctionLookup map[exp.BooleanOperation][]byte
 		// A map used to look up BitwiseOperations and their SQL equivalents
 		// (Default=map[exp.BitwiseOperation][]byte{
 		// 		exp.BitwiseInversionOp:  []byte("~"),

sqlgen/sql_dialect_options_test.go

@@ -44,6 +44,12 @@ func (sfts *sqlFragmentTypeSuite) TestOptions_SQLFragmentType() {
 	}
 }
 
+func (sfts *sqlFragmentTypeSuite) TestDefaultDialectOptions_BooleanFunctionLookup() {
+	opts := sqlgen.DefaultDialectOptions()
+	// 默认不设置函数式操作符，各方言按需覆盖
+	sfts.Nil(opts.BooleanFunctionLookup)
+}
+
 func TestSQLFragmentType(t *testing.T) {
 	suite.Run(t, new(sqlFragmentTypeSuite))
 }