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Add support for expressions in SELECT clause

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This commit is contained in:
Pijus Kamandulis
2025-05-20 22:40:00 +03:00
parent e20a6ca7cd
commit 560ea5296d
6 changed files with 2031 additions and 1715 deletions
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13
query_executors/memory_executor/common.go
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@@ -69,6 +69,19 @@ func (r rowContext) resolveSelectItem(selectItem parsers.SelectItem) interface{}
return nil
}
if selectItem.Type == parsers.SelectItemTypeExpression {
if typedExpression, ok := selectItem.Value.(parsers.ComparisonExpression); ok {
return r.filters_ComparisonExpression(typedExpression)
}
if typedExpression, ok := selectItem.Value.(parsers.LogicalExpression); ok {
return r.filters_LogicalExpression(typedExpression)
}
logger.ErrorLn("parsers.SelectItem has incorrect Value type (expected parsers.ComparisonExpression)")
return nil
}
return r.selectItem_SelectItemTypeField(selectItem)
}

92
query_executors/memory_executor/comparison_expression_test.go Normal file
View File

@@ -0,0 +1,92 @@
package memoryexecutor_test
import (
"testing"
"github.com/pikami/cosmium/parsers"
memoryexecutor "github.com/pikami/cosmium/query_executors/memory_executor"
testutils "github.com/pikami/cosmium/test_utils"
)
func Test_Execute_Expressions(t *testing.T) {
mockData := []memoryexecutor.RowType{
map[string]interface{}{"id": "123", "age": 10, "isCool": true},
map[string]interface{}{"id": "456", "age": 20, "isCool": false},
map[string]interface{}{"id": "789", "age": 30, "isCool": true},
}
t.Run("Should execute comparison expressions in SELECT", func(t *testing.T) {
testQueryExecute(
t,
parsers.SelectStmt{
SelectItems: []parsers.SelectItem{
{
Path: []string{"c", "id"},
Type: parsers.SelectItemTypeField,
},
{
Alias: "isAdult",
Type: parsers.SelectItemTypeExpression,
Value: parsers.ComparisonExpression{
Operation: ">=",
Left: testutils.SelectItem_Path("c", "age"),
Right: testutils.SelectItem_Constant_Int(18),
},
},
{
Alias: "isNotCool",
Type: parsers.SelectItemTypeExpression,
Value: parsers.ComparisonExpression{
Operation: "!=",
Left: testutils.SelectItem_Path("c", "isCool"),
Right: testutils.SelectItem_Constant_Bool(true),
},
},
},
Table: parsers.Table{SelectItem: testutils.SelectItem_Path("c")},
},
mockData,
[]memoryexecutor.RowType{
map[string]interface{}{"id": "123", "isAdult": false, "isNotCool": false},
map[string]interface{}{"id": "456", "isAdult": true, "isNotCool": true},
map[string]interface{}{"id": "789", "isAdult": true, "isNotCool": false},
},
)
})
t.Run("Should execute logical expressions in SELECT", func(t *testing.T) {
testQueryExecute(
t,
parsers.SelectStmt{
SelectItems: []parsers.SelectItem{
{
Path: []string{"c", "id"},
Type: parsers.SelectItemTypeField,
},
{
Alias: "isCoolAndAdult",
Type: parsers.SelectItemTypeExpression,
Value: parsers.LogicalExpression{
Operation: parsers.LogicalExpressionTypeAnd,
Expressions: []interface{}{
testutils.SelectItem_Path("c", "isCool"),
parsers.ComparisonExpression{
Operation: ">=",
Left: testutils.SelectItem_Path("c", "age"),
Right: testutils.SelectItem_Constant_Int(18),
},
},
},
},
},
Table: parsers.Table{SelectItem: testutils.SelectItem_Path("c")},
},
mockData,
[]memoryexecutor.RowType{
map[string]interface{}{"id": "123", "isCoolAndAdult": false},
map[string]interface{}{"id": "456", "isCoolAndAdult": false},
map[string]interface{}{"id": "789", "isCoolAndAdult": true},
},
)
})
}