diff --git a/apps/desktop/src/components/grid/DataGrid.vue b/apps/desktop/src/components/grid/DataGrid.vue
index 8acbf03d3..3ef841013 100644
--- a/apps/desktop/src/components/grid/DataGrid.vue
+++ b/apps/desktop/src/components/grid/DataGrid.vue
@@ -7404,6 +7404,7 @@ const gridContextMenuItems = computed<ContextMenuItem[]>(() => {
                   v-model:order-by-input="orderByInput"
                   v-model:filter-builder-open="filterBuilderOpen"
                   :columns="props.tableMeta?.columns.map((column) => column.name) ?? props.result.columns"
+                  :condition-columns="props.tableMeta?.columns ?? props.result.columns"
                   :history-scope="conditionHistoryScope"
                   :can-use-where-search="canUseWhereSearch"
                   :compact="compactDataGridToolbar"
diff --git a/apps/desktop/src/components/grid/DataGridConditionEditor.vue b/apps/desktop/src/components/grid/DataGridConditionEditor.vue
index bd42ccd04..ede30dc33 100644
--- a/apps/desktop/src/components/grid/DataGridConditionEditor.vue
+++ b/apps/desktop/src/components/grid/DataGridConditionEditor.vue
@@ -1,14 +1,14 @@
 <script setup lang="ts">
 import { computed, nextTick, onMounted, onUnmounted, ref, useId, watch, type CSSProperties } from "vue";
 import { ChevronDown, X } from "@lucide/vue";
-import { useDataGridConditionEditor, type DataGridConditionSuggestionProvider } from "@/composables/useDataGridConditionEditor";
-import { getDataGridConditionSuggestionPosition } from "@/lib/dataGrid/dataGridConditionSuggestionPosition";
+import { useDataGridConditionEditor, type DataGridConditionColumnOption, type DataGridConditionSuggestionProvider } from "@/composables/useDataGridConditionEditor";
+import { getDataGridConditionSuggestionPosition, getDataGridConditionSuggestionPreferredWidth } from "@/lib/dataGrid/dataGridConditionSuggestionPosition";
 import type { DataGridConditionHistoryKind, DataGridConditionHistoryScope } from "@/lib/dataGrid/dataGridConditionHistory";
 
 const props = withDefaults(
   defineProps<{
     kind: DataGridConditionHistoryKind;
-    columns?: readonly string[];
+    columns?: readonly DataGridConditionColumnOption[];
     historyScope: DataGridConditionHistoryScope;
     placeholder?: string;
     ariaLabel?: string;
@@ -64,6 +64,7 @@ const activeEditor = computed(() => overlayRef.value ?? inputRef.value);
 const hasValue = computed(() => modelValue.value.trim().length > 0);
 const emptyHistoryText = computed(() => (modelValue.value.trim() ? props.historyNoMatchesText : props.historyEmptyText));
 const activeSuggestionId = computed(() => (editor.highlightedIndex.value >= 0 ? `${suggestionListId}-${editor.highlightedIndex.value}` : undefined));
+const suggestionPreferredWidth = computed(() => getDataGridConditionSuggestionPreferredWidth(editor.suggestions.value));
 const suggestionStyle = computed<CSSProperties>(() => ({
   left: `${suggestionPosition.value.left}px`,
   top: `${suggestionPosition.value.top}px`,
@@ -112,7 +113,11 @@ function updateSuggestionPosition() {
   void nextTick(() => {
     const target = activeEditor.value;
     if (!target) return;
-    suggestionPosition.value = getDataGridConditionSuggestionPosition(target.getBoundingClientRect(), { viewportWidth: window.innerWidth });
+    suggestionPosition.value = getDataGridConditionSuggestionPosition(target.getBoundingClientRect(), {
+      viewportWidth: window.innerWidth,
+      preferredWidth: suggestionPreferredWidth.value,
+      maxWidth: suggestionPreferredWidth.value === undefined ? undefined : 520,
+    });
   });
 }
 
@@ -234,6 +239,9 @@ function hideHistoryPreview() {
 }
 
 watch(modelValue, () => resizeEditor());
+watch(suggestionPreferredWidth, () => {
+  if (editor.dropdownOpen.value) updateSuggestionPosition();
+});
 watch(
   () => editor.dropdownOpen.value,
   (open) => {
@@ -357,7 +365,10 @@ defineExpose({ focus, dismiss: editor.dismiss, rememberHistory: editor.rememberH
           "
           @mouseleave="hideHistoryPreview"
         >
-          <span data-condition-history-text class="min-w-0 flex-1 truncate font-mono">{{ suggestion.value }}</span>
+          <span data-condition-history-text class="data-grid-condition-suggestion-field min-w-0 truncate" :class="suggestion.comment ? 'max-w-[75%] shrink-0' : 'flex-1'" :title="suggestion.value">
+            {{ suggestion.value }}
+          </span>
+          <span v-if="suggestion.comment" class="ml-3 min-w-0 flex-1 truncate text-right text-muted-foreground" :title="suggestion.comment">{{ suggestion.comment }}</span>
           <button v-if="suggestion.kind === 'history'" type="button" class="ml-2 shrink-0 text-muted-foreground hover:text-foreground" @mousedown.stop.prevent="editor.deleteHistory(suggestion.value)">
             <X class="h-3 w-3" />
           </button>
@@ -418,6 +429,16 @@ defineExpose({ focus, dismiss: editor.dismiss, rememberHistory: editor.rememberH
   transform: translateX(-4px);
 }
 
+.data-grid-topbar-condition-input,
+.data-grid-condition-suggestion-field {
+  font-family: var(--data-grid-condition-font-family, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);
+  font-size: 0.875rem;
+  font-variant-ligatures: none;
+  font-feature-settings:
+    "liga" 0,
+    "calt" 0;
+}
+
 .data-grid-topbar-condition-input {
   width: 100%;
   max-width: 100%;
@@ -430,13 +451,7 @@ defineExpose({ focus, dismiss: editor.dismiss, rememberHistory: editor.rememberH
   border-radius: 0;
   appearance: none;
   scrollbar-width: none;
-  font-family: var(--data-grid-condition-font-family, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);
-  font-size: 0.875rem;
   line-height: 1.5rem;
-  font-variant-ligatures: none;
-  font-feature-settings:
-    "liga" 0,
-    "calt" 0;
 }
 
 :global(.dark) .data-grid-topbar-condition-input {
diff --git a/apps/desktop/src/components/grid/DataGridQueryControls.vue b/apps/desktop/src/components/grid/DataGridQueryControls.vue
index df8521389..9e0710c38 100644
--- a/apps/desktop/src/components/grid/DataGridQueryControls.vue
+++ b/apps/desktop/src/components/grid/DataGridQueryControls.vue
@@ -6,6 +6,7 @@ import { Button } from "@/components/ui/button";
 import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
 import DataGridConditionEditor from "@/components/grid/DataGridConditionEditor.vue";
 import DataGridFilterBuilder from "@/components/grid/DataGridFilterBuilder.vue";
+import type { DataGridConditionColumnOption } from "@/composables/useDataGridConditionEditor";
 import type { DataGridStructuredFilterRule } from "@/composables/useDataGridFilterBuilder";
 import type { DataGridConditionHistoryScope } from "@/lib/dataGrid/dataGridConditionHistory";
 import type { DataGridContextFilterMode } from "@/lib/dataGrid/dataGridSql";
@@ -22,6 +23,7 @@ const props = defineProps<{
   whereInput: string;
   orderByInput: string;
   columns: readonly string[];
+  conditionColumns: readonly DataGridConditionColumnOption[];
   historyScope: DataGridConditionHistoryScope;
   canUseWhereSearch: boolean;
   compact: boolean;
@@ -174,7 +176,7 @@ onUnmounted(onResizeEnd);
       <DataGridConditionEditor
         :model-value="whereInput"
         kind="where"
-        :columns="columns"
+        :columns="conditionColumns"
         :history-scope="historyScope"
         placeholder="WHERE"
         :history-empty-text="t('grid.conditionHistoryEmpty')"
@@ -199,7 +201,7 @@ onUnmounted(onResizeEnd);
       <DataGridConditionEditor
         :model-value="orderByInput"
         kind="orderBy"
-        :columns="columns"
+        :columns="conditionColumns"
         :history-scope="historyScope"
         placeholder="ORDER BY"
         :history-empty-text="t('grid.conditionHistoryEmpty')"
diff --git a/apps/desktop/src/composables/__tests__/useDataGridConditionEditor.spec.ts b/apps/desktop/src/composables/__tests__/useDataGridConditionEditor.spec.ts
index 699f8f91f..c3c130c38 100644
--- a/apps/desktop/src/composables/__tests__/useDataGridConditionEditor.spec.ts
+++ b/apps/desktop/src/composables/__tests__/useDataGridConditionEditor.spec.ts
@@ -41,6 +41,64 @@ describe("useDataGridConditionEditor", () => {
     expect(value.value).toBe("status = customer_name");
   });
 
+  it("reuses column comments for field suggestions without adding them to history", async () => {
+    const scope = { connectionId: "connection", database: "db", tableName: "users" };
+    rememberDataGridConditionHistory("where", scope, "customer_id = 1");
+    const value = ref("");
+    const editor = useDataGridConditionEditor({
+      kind: "where",
+      value,
+      columns: [
+        { name: "customer_id", comment: "客户编号" },
+        { name: "customer_name", comment: null },
+      ],
+      historyScope: scope,
+    });
+
+    value.value = "cust";
+    await nextTick();
+    await vi.waitFor(() =>
+      expect(editor.suggestions.value).toEqual([
+        { value: "customer_id", kind: "column", comment: "客户编号" },
+        { value: "customer_name", kind: "column" },
+      ]),
+    );
+
+    value.value = "customer";
+    editor.dismiss();
+    editor.openHistory();
+    expect(editor.suggestions.value).toEqual([{ value: "customer_id = 1", kind: "history" }]);
+  });
+
+  it.each(["where", "orderBy"] as const)("normalizes %s comments from different metadata providers", async (kind) => {
+    const value = ref("");
+    const editor = useDataGridConditionEditor({
+      kind,
+      value,
+      columns: [
+        "customer_plain",
+        { name: "customer_native", comment: "  原生注释  " },
+        { name: "customer_jdbc", comment: "JDBC remarks" },
+        { name: "customer_null", comment: null },
+        { name: "customer_blank", comment: " \n\t " },
+        { name: "customer_invalid", comment: 42 } as unknown as { name: string; comment: string },
+      ],
+      historyScope: {},
+    });
+
+    value.value = "cust";
+    await nextTick();
+    await vi.waitFor(() => expect(editor.suggestions.value).toHaveLength(6));
+    expect(editor.suggestions.value).toEqual([
+      { value: "customer_plain", kind: "column" },
+      { value: "customer_native", kind: "column", comment: "原生注释" },
+      { value: "customer_jdbc", kind: "column", comment: "JDBC remarks" },
+      { value: "customer_null", kind: "column" },
+      { value: "customer_blank", kind: "column" },
+      { value: "customer_invalid", kind: "column" },
+    ]);
+  });
+
   it("ignores stale asynchronous suggestion responses", async () => {
     vi.useFakeTimers();
     const value = ref("");
diff --git a/apps/desktop/src/composables/useDataGridConditionEditor.ts b/apps/desktop/src/composables/useDataGridConditionEditor.ts
index 837e5ddb1..e30705e14 100644
--- a/apps/desktop/src/composables/useDataGridConditionEditor.ts
+++ b/apps/desktop/src/composables/useDataGridConditionEditor.ts
@@ -3,9 +3,17 @@ import { forgetDataGridConditionHistory, loadDataGridConditionHistory, rememberD
 
 export type DataGridConditionSuggestionKind = "column" | "history";
 
+export interface DataGridConditionColumnSuggestion {
+  name: string;
+  comment?: string | null;
+}
+
+export type DataGridConditionColumnOption = string | DataGridConditionColumnSuggestion;
+
 export interface DataGridConditionSuggestion {
   value: string;
   kind: DataGridConditionSuggestionKind;
+  comment?: string;
 }
 
 export interface DataGridConditionSuggestionContext {
@@ -20,7 +28,7 @@ export type DataGridConditionSuggestionProvider = (context: DataGridConditionSug
 export interface UseDataGridConditionEditorOptions {
   kind: DataGridConditionHistoryKind;
   value: Ref<string>;
-  columns?: MaybeRefOrGetter<readonly string[] | undefined>;
+  columns?: MaybeRefOrGetter<readonly DataGridConditionColumnOption[] | undefined>;
   historyScope: MaybeRefOrGetter<DataGridConditionHistoryScope>;
   suggestionProvider?: DataGridConditionSuggestionProvider;
   suggestionDebounceMs?: number;
@@ -30,6 +38,11 @@ export interface UseDataGridConditionEditorOptions {
 const WHERE_TOKEN_PATTERN = /([^\s,()><=!&|]+)$/;
 const ORDER_BY_TOKEN_PATTERN = /([^\s,()]+)$/;
 
+function normalizedColumnComment(column: DataGridConditionColumnOption): string | undefined {
+  if (typeof column === "string" || typeof column.comment !== "string") return undefined;
+  return column.comment.trim() || undefined;
+}
+
 function activeToken(kind: DataGridConditionHistoryKind, value: string): string {
   return (
     value
@@ -73,10 +86,20 @@ export function useDataGridConditionEditor(options: UseDataGridConditionEditorOp
     historyOpen.value = false;
   }
 
-  function defaultSuggestions(token: string): readonly string[] {
+  function defaultSuggestions(token: string): DataGridConditionSuggestion[] {
     const normalizedToken = token.toLowerCase();
     if (!normalizedToken) return [];
-    return (toValue(options.columns) ?? []).filter((column) => column.toLowerCase().startsWith(normalizedToken) && column.toLowerCase() !== normalizedToken);
+    const seen = new Set<string>();
+    const suggestions: DataGridConditionSuggestion[] = [];
+    for (const column of toValue(options.columns) ?? []) {
+      const value = typeof column === "string" ? column : column.name;
+      const normalizedValue = value.toLowerCase();
+      if (!normalizedValue.startsWith(normalizedToken) || normalizedValue === normalizedToken || seen.has(value)) continue;
+      seen.add(value);
+      const comment = normalizedColumnComment(column);
+      suggestions.push({ value, kind: "column", ...(comment ? { comment } : {}) });
+    }
+    return suggestions;
   }
 
   async function loadSuggestions(value: string, requestId: number, controller: AbortController) {
@@ -84,11 +107,11 @@ export function useDataGridConditionEditor(options: UseDataGridConditionEditorOp
     if (!token) return;
     suggestionsLoading.value = true;
     try {
-      const values = options.suggestionProvider ? await options.suggestionProvider({ kind: options.kind, value, token, signal: controller.signal }) : defaultSuggestions(token);
+      const values = options.suggestionProvider ? await options.suggestionProvider({ kind: options.kind, value, token, signal: controller.signal }) : undefined;
       // A slower request must never replace suggestions for a newer editor value.
       if (controller.signal.aborted || requestId !== suggestionRequestId || options.value.value !== value || historyOpen.value) return;
       const limit = options.suggestionLimit ?? 8;
-      suggestions.value = [...new Set(values)].slice(0, limit).map((suggestion) => ({ value: suggestion, kind: "column" }));
+      suggestions.value = values ? [...new Set(values)].slice(0, limit).map((suggestion) => ({ value: suggestion, kind: "column" })) : defaultSuggestions(token).slice(0, limit);
       highlightedIndex.value = suggestions.value.length > 0 ? 0 : -1;
     } catch (error) {
       if (!controller.signal.aborted && requestId === suggestionRequestId) {
diff --git a/apps/desktop/src/lib/__tests__/dataGrid/dataGridConditionSuggestionPosition.spec.ts b/apps/desktop/src/lib/__tests__/dataGrid/dataGridConditionSuggestionPosition.spec.ts
index 26b6f0b64..b7bc32dcf 100644
--- a/apps/desktop/src/lib/__tests__/dataGrid/dataGridConditionSuggestionPosition.spec.ts
+++ b/apps/desktop/src/lib/__tests__/dataGrid/dataGridConditionSuggestionPosition.spec.ts
@@ -1,6 +1,6 @@
 import { describe, expect, test } from "vitest";
 
-import { getDataGridConditionSuggestionPosition } from "@/lib/dataGrid/dataGridConditionSuggestionPosition";
+import { getDataGridConditionSuggestionPosition, getDataGridConditionSuggestionPreferredWidth } from "@/lib/dataGrid/dataGridConditionSuggestionPosition";
 
 describe("getDataGridConditionSuggestionPosition", () => {
   test("anchors the dropdown to the input instead of the caret", () => {
@@ -21,4 +21,35 @@ describe("getDataGridConditionSuggestionPosition", () => {
 
     expect(position.width).toBe(180);
   });
+
+  test("widens commented field suggestions within the configured maximum", () => {
+    const preferredWidth = getDataGridConditionSuggestionPreferredWidth([
+      { value: "customer_external_identifier", kind: "column", comment: "客户外部系统唯一标识" },
+      { value: "customer_name", kind: "column", comment: "客户名称" },
+    ]);
+    const position = getDataGridConditionSuggestionPosition({ left: 120, bottom: 40, width: 220 }, { viewportWidth: 1000, preferredWidth, maxWidth: 520 });
+
+    expect(preferredWidth).toBeGreaterThan(220);
+    expect(position.width).toBe(preferredWidth);
+    expect(position.width).toBeLessThanOrEqual(520);
+  });
+
+  test("keeps normal width when suggestions have no comments or are history entries", () => {
+    expect(
+      getDataGridConditionSuggestionPreferredWidth([
+        { value: "customer_id", kind: "column", comment: "" },
+        { value: "status = 'active'", kind: "history" },
+      ]),
+    ).toBeUndefined();
+
+    const position = getDataGridConditionSuggestionPosition({ left: 120, bottom: 40, width: 220 }, { viewportWidth: 1000, preferredWidth: undefined, maxWidth: 520 });
+    expect(position.width).toBe(220);
+  });
+
+  test("caps commented suggestions to both the maximum and the viewport", () => {
+    const position = getDataGridConditionSuggestionPosition({ left: 760, bottom: 40, width: 180 }, { viewportWidth: 420, preferredWidth: 800, maxWidth: 520 });
+
+    expect(position.width).toBe(404);
+    expect(position.left + position.width).toBeLessThanOrEqual(412);
+  });
 });
diff --git a/apps/desktop/src/lib/dataGrid/dataGridConditionSuggestionPosition.ts b/apps/desktop/src/lib/dataGrid/dataGridConditionSuggestionPosition.ts
index d7d44119f..9ead50cf3 100644
--- a/apps/desktop/src/lib/dataGrid/dataGridConditionSuggestionPosition.ts
+++ b/apps/desktop/src/lib/dataGrid/dataGridConditionSuggestionPosition.ts
@@ -7,6 +7,8 @@ export interface DataGridConditionSuggestionRect {
 export interface DataGridConditionSuggestionPositionOptions {
   viewportWidth: number;
   minWidth?: number;
+  preferredWidth?: number;
+  maxWidth?: number;
   viewportMargin?: number;
   topOffset?: number;
 }
@@ -17,12 +19,33 @@ export interface DataGridConditionSuggestionPosition {
   width: number;
 }
 
+export interface DataGridConditionSuggestionContent {
+  value: string;
+  kind: "column" | "history";
+  comment?: string | null;
+}
+
+const COMMENTED_SUGGESTION_MIN_WIDTH = 360;
+const COMMENTED_SUGGESTION_MAX_WIDTH = 520;
+
+function textWidthUnits(value: string): number {
+  return [...value].reduce((total, character) => total + (character.charCodeAt(0) > 0xff ? 2 : 1), 0);
+}
+
+export function getDataGridConditionSuggestionPreferredWidth(suggestions: readonly DataGridConditionSuggestionContent[]): number | undefined {
+  const hasComment = suggestions.some((suggestion) => suggestion.kind === "column" && !!suggestion.comment?.trim());
+  if (!hasComment) return undefined;
+  const longestFieldUnits = suggestions.reduce((longest, suggestion) => (suggestion.kind === "column" ? Math.max(longest, textWidthUnits(suggestion.value)) : longest), 0);
+  return Math.min(COMMENTED_SUGGESTION_MAX_WIDTH, Math.max(COMMENTED_SUGGESTION_MIN_WIDTH, Math.ceil(longestFieldUnits * 7.5 + 208)));
+}
+
 export function getDataGridConditionSuggestionPosition(inputRect: DataGridConditionSuggestionRect, options: DataGridConditionSuggestionPositionOptions): DataGridConditionSuggestionPosition {
   const minWidth = options.minWidth ?? 180;
   const viewportMargin = options.viewportMargin ?? 8;
   const topOffset = options.topOffset ?? 2;
-  const availableWidth = Math.max(minWidth, options.viewportWidth - viewportMargin * 2);
-  const width = Math.min(Math.max(inputRect.width, minWidth), availableWidth);
+  const availableWidth = Math.max(0, options.viewportWidth - viewportMargin * 2);
+  const widthLimit = Math.min(availableWidth, options.maxWidth ?? availableWidth);
+  const width = Math.min(Math.max(inputRect.width, minWidth, options.preferredWidth ?? 0), widthLimit);
   const maxLeft = Math.max(viewportMargin, options.viewportWidth - viewportMargin - width);
   const left = Math.min(Math.max(inputRect.left, viewportMargin), maxLeft);