Implement STRINGEQUALS

query_executors/memory_executor/memory_executor.go

@@ -161,6 +161,20 @@ func getFieldValue(field parsers.SelectItem, queryParameters map[string]interfac
 		return typedValue.Value
 	}
 
+	if field.Type == parsers.SelectItemTypeFunctionCall {
+		var typedValue parsers.FunctionCall
+		var ok bool
+		if typedValue, ok = field.Value.(parsers.FunctionCall); !ok {
+			// TODO: Handle error
+			fmt.Println("parsers.Constant has incorrect Value type")
+		}
+
+		switch typedValue.Type {
+		case parsers.FunctionCallStringEquals:
+			return strings_StringEquals(typedValue.Arguments, queryParameters, row)
+		}
+	}
+
 	value := row
 	if len(field.Path) > 1 {
 		for _, pathSegment := range field.Path[1:] {

query_executors/memory_executor/memory_executor_string_functions_test.go

@@ -0,0 +1,106 @@
+package memoryexecutor_test
+
+import (
+	"testing"
+
+	"github.com/pikami/cosmium/parsers"
+	memoryexecutor "github.com/pikami/cosmium/query_executors/memory_executor"
+)
+
+func Test_Execute_StringFunctions(t *testing.T) {
+	mockData := []memoryexecutor.RowType{
+		map[string]interface{}{"id": "123", "pk": "aaa"},
+		map[string]interface{}{"id": "456", "pk": "bbb"},
+		map[string]interface{}{"id": "789", "pk": "AAA"},
+	}
+
+	t.Run("Should execute function STRINGEQUALS(ex1, ex2, ignoreCase)", func(t *testing.T) {
+		testQueryExecute(
+			t,
+			parsers.SelectStmt{
+				SelectItems: []parsers.SelectItem{
+					{
+						Path: []string{"c", "id"},
+						Type: parsers.SelectItemTypeField,
+					},
+					{
+						Alias: "stringEquals",
+						Type:  parsers.SelectItemTypeFunctionCall,
+						Value: parsers.FunctionCall{
+							Type: parsers.FunctionCallStringEquals,
+							Arguments: []interface{}{
+								parsers.SelectItem{
+									Path: []string{"c", "pk"},
+									Type: parsers.SelectItemTypeField,
+								},
+								parsers.SelectItem{
+									Type: parsers.SelectItemTypeConstant,
+									Value: parsers.Constant{
+										Type:  parsers.ConstantTypeString,
+										Value: "aaa",
+									},
+								},
+								parsers.SelectItem{
+									Type: parsers.SelectItemTypeConstant,
+									Value: parsers.Constant{
+										Type:  parsers.ConstantTypeBoolean,
+										Value: true,
+									},
+								},
+							},
+						},
+					},
+				},
+				Table: parsers.Table{Value: "c"},
+			},
+			mockData,
+			[]memoryexecutor.RowType{
+				map[string]interface{}{"id": "123", "stringEquals": true},
+				map[string]interface{}{"id": "456", "stringEquals": false},
+				map[string]interface{}{"id": "789", "stringEquals": true},
+			},
+		)
+	})
+
+	t.Run("Should execute function STRINGEQUALS(ex1, ex2)", func(t *testing.T) {
+		testQueryExecute(
+			t,
+			parsers.SelectStmt{
+				SelectItems: []parsers.SelectItem{
+					{
+						Path: []string{"c", "id"},
+						Type: parsers.SelectItemTypeField,
+					},
+					{
+						Alias: "stringEquals",
+						Type:  parsers.SelectItemTypeFunctionCall,
+						Value: parsers.FunctionCall{
+							Type: parsers.FunctionCallStringEquals,
+							Arguments: []interface{}{
+								parsers.SelectItem{
+									Path: []string{"c", "pk"},
+									Type: parsers.SelectItemTypeField,
+								},
+								parsers.SelectItem{
+									Type: parsers.SelectItemTypeConstant,
+									Value: parsers.Constant{
+										Type:  parsers.ConstantTypeString,
+										Value: "aaa",
+									},
+								},
+								nil,
+							},
+						},
+					},
+				},
+				Table: parsers.Table{Value: "c"},
+			},
+			mockData,
+			[]memoryexecutor.RowType{
+				map[string]interface{}{"id": "123", "stringEquals": true},
+				map[string]interface{}{"id": "456", "stringEquals": false},
+				map[string]interface{}{"id": "789", "stringEquals": false},
+			},
+		)
+	})
+}

query_executors/memory_executor/string_functions.go

@@ -0,0 +1,41 @@
+package memoryexecutor
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pikami/cosmium/parsers"
+)
+
+func strings_StringEquals(arguments []interface{}, queryParameters map[string]interface{}, row RowType) bool {
+	ignoreCase := false
+	if len(arguments) > 2 && arguments[2] != nil {
+		ignoreCaseItem := arguments[2].(parsers.SelectItem)
+		if value, ok := getFieldValue(ignoreCaseItem, queryParameters, row).(bool); ok {
+			ignoreCase = value
+		}
+	}
+
+	ex1Item := arguments[0].(parsers.SelectItem)
+	ex2Item := arguments[1].(parsers.SelectItem)
+
+	ex1 := getFieldValue(ex1Item, queryParameters, row)
+	ex2 := getFieldValue(ex2Item, queryParameters, row)
+
+	var ok bool
+	var str1 string
+	var str2 string
+
+	if str1, ok = ex1.(string); !ok {
+		fmt.Println("StringEquals got parameters of wrong type")
+	}
+	if str2, ok = ex2.(string); !ok {
+		fmt.Println("StringEquals got parameters of wrong type")
+	}
+
+	if ignoreCase {
+		return strings.EqualFold(str1, str2)
+	}
+
+	return str1 == str2
+}