"first_null_row" configuration option

internal/topdata/topdata.go

@@ -265,7 +265,7 @@ func ValidateProject(p *project.Project) ValidationReport {
 	validateTopPackageAssets(sourceDir, dataDir, &report)
 	validateNativeOutputCatalog(dataDir, &report)
 	validateNativeEntryKeyUniqueness(dataDir, &report)
-	validateNativeLockAllocation(dataDir, &report)
+	validateNativeLockAllocation(dataDir, p.EffectiveConfig().TopData.RowGeneration, &report)
 	validateGeneratedFeatFamilies(dataDir, &report)
 	validateItempropsRegistryGraph(dataDir, &report)
 	if _, err := os.Stat(statePath); err == nil {
@@ -273,7 +273,7 @@ func ValidateProject(p *project.Project) ValidationReport {
 		_ = validateJSONFile(statePath, "state", &report)
 	}
 	if !report.HasErrors() {
-		validateNativeAuthoringWarnings(dataDir, &report)
+		validateNativeAuthoringWarnings(dataDir, p.EffectiveConfig().TopData.RowGeneration, &report)
 		validateNativeBuildability(p, &report)
 	}
 
@@ -1089,7 +1089,7 @@ func validateNativeEntryKeyUniqueness(dataDir string, report *ValidationReport)
 	}
 }
 
-func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
+func validateNativeLockAllocation(dataDir string, rowGeneration []project.TopDataRowGenerationConfig, report *ValidationReport) {
 	datasets, err := discoverNativeDatasets(dataDir)
 	if err != nil {
 		report.Diagnostics = append(report.Diagnostics, Diagnostic{
@@ -1099,6 +1099,7 @@ func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
 		})
 		return
 	}
+	datasets = applyTopDataRowGeneration(datasets, rowGeneration)
 	for _, dataset := range datasets {
 		if dataset.Kind != nativeDatasetBase {
 			continue
@@ -1118,6 +1119,8 @@ func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
 		}
 		baseBoundaryID := len(rawRows) - 1
 		baseKeys := map[string]struct{}{}
+		nullBaseIDs := map[int]struct{}{}
+		columns, _ := parseColumns(baseObj, dataset.Name)
 		for index, raw := range rawRows {
 			row, ok := raw.(map[string]any)
 			if !ok {
@@ -1133,6 +1136,12 @@ func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
 			if key, ok := row["key"].(string); ok && key != "" {
 				baseKeys[key] = struct{}{}
 			}
+			if len(columns) > 0 {
+				canonical, err := canonicalizeBaseRow(dataset, columns, row, index)
+				if err == nil && isNativeAllocationNullRow(canonical, columns) {
+					nullBaseIDs[rowID] = struct{}{}
+				}
+			}
 		}
 		explicitModuleIDs := map[string]int{}
 		for _, dir := range []string{dataset.ModulesDir, dataset.GeneratedDir} {
@@ -1208,6 +1217,11 @@ func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
 			if rowID > baseBoundaryID {
 				continue
 			}
+			if dataset.RowGeneration == "first_null_row" {
+				if _, ok := nullBaseIDs[rowID]; ok {
+					continue
+				}
+			}
 			if _, ok := baseKeys[key]; ok {
 				continue
 			}
@@ -1226,11 +1240,12 @@ func validateNativeLockAllocation(dataDir string, report *ValidationReport) {
 	}
 }
 
-func validateNativeAuthoringWarnings(dataDir string, report *ValidationReport) {
+func validateNativeAuthoringWarnings(dataDir string, rowGeneration []project.TopDataRowGenerationConfig, report *ValidationReport) {
 	datasets, err := discoverNativeDatasets(dataDir)
 	if err != nil {
 		return
 	}
+	datasets = applyTopDataRowGeneration(datasets, rowGeneration)
 	for _, dataset := range datasets {
 		if dataset.Kind != nativeDatasetBase {
 			continue
@@ -1256,6 +1271,7 @@ func validateDatasetOverrideTargetWarnings(dataset nativeDataset, report *Valida
 	if !ok {
 		return
 	}
+	columns, _ := parseColumns(baseObj, dataset.Name)
 	rowIDToKey := map[int]string{}
 	keyToID := map[string]int{}
 	usedIDs := map[int]struct{}{}
@@ -1270,6 +1286,12 @@ func validateDatasetOverrideTargetWarnings(dataset nativeDataset, report *Valida
 				rowID = parsed
 			}
 		}
+		if dataset.RowGeneration == "first_null_row" && len(columns) > 0 {
+			canonical, err := canonicalizeBaseRow(dataset, columns, row, index)
+			if err == nil && isNativeAllocationNullRow(canonical, columns) {
+				continue
+			}
+		}
 		usedIDs[rowID] = struct{}{}
 		if key, ok := row["key"].(string); ok && key != "" {
 			rowIDToKey[rowID] = key