fix: Postgres rows count of large tables

query optimized to handle large tables row count

re #283

Signed-off-by: Pranav C Balan <pranavxc@gmail.com>

packages/nc-gui/components/project/spreadsheet/rowsXcDataTable.vue

@@ -214,32 +214,35 @@
           </template>
 
         </div>
-        <v-pagination
-          v-if="data && count !== Infinity"
-          style="max-width: 100%"
-          v-model="page"
-          :length="Math.ceil(count / size)"
-          :total-visible="8"
-          @input="loadTableData"
-          color="primary lighten-2"
-        ></v-pagination>
-        <div class="mx-auto d-flex align-center mt-n1 " style="max-width:250px">
-          <span class="caption" style="white-space: nowrap"> Change page:</span>
-          <v-text-field
-            class="ml-1 caption"
-            :full-width="false"
-            outlined
-            dense
-            hide-details
+        <template v-if="data">
+          <v-pagination
+            v-if="count !== Infinity"
+            style="max-width: 100%"
             v-model="page"
-            @keydown.enter="loadTableData"
-            type="number"
-          >
-            <template #append>
-              <x-icon tooltip="Change page" small icon.class="mt-1" @click="loadTableData">mdi-keyboard-return</x-icon>
-            </template>
-          </v-text-field>
-        </div>
+            :length="Math.ceil(count / size)"
+            :total-visible="8"
+            @input="loadTableData"
+            color="primary lighten-2"
+          ></v-pagination>
+          <div v-else class="mx-auto d-flex align-center mt-n1 " style="max-width:250px">
+            <span class="caption" style="white-space: nowrap"> Change page:</span>
+            <v-text-field
+              class="ml-1 caption"
+              :full-width="false"
+              outlined
+              dense
+              hide-details
+              v-model="page"
+              @keydown.enter="loadTableData"
+              type="number"
+            >
+              <template #append>
+                <x-icon tooltip="Change page" small icon.class="mt-1" @click="loadTableData">mdi-keyboard-return
+                </x-icon>
+              </template>
+            </v-text-field>
+          </div>
+        </template>
         <!--      <div v-else class="d-flex justify-center py-4">-->
         <!--        <v-alert type="info" dense class="ma-1 flex-shrink-1">Table is empty</v-alert>-->
         <!--      </div>-->

packages/nocodb/src/lib/dataMapper/lib/sql/BaseModelSql.ts

@@ -252,8 +252,8 @@ class BaseModelSql extends BaseModel {
 
       const query = driver(this.tn).insert(insertObj);
 
-      if (this.dbDriver.clientType() === 'pg' || this.dbDriver.clientType() === 'mssql') {
-        query.returning(Object.entries(this.aliasToColumn).map(([val,key]) => `${key} as ${val}`));
+      if (this.isPg() || this.dbDriver.clientType() === 'mssql') {
+        query.returning(Object.entries(this.aliasToColumn).map(([val, key]) => `${key} as ${val}`));
         response = await this._run(query);
       }
 
@@ -282,6 +282,10 @@ class BaseModelSql extends BaseModel {
   }
 
 
+  private isPg() {
+    return this.dbDriver.clientType() === 'pg';
+  }
+
   /**
    * Update table row data by primary key
    *
@@ -800,6 +804,16 @@ class BaseModelSql extends BaseModel {
    */
   async countByPk({where = '', conditionGraph = null}) {
     try {
+      if (this.isPg() && !conditionGraph && !where) {
+        return (await this._run(
+          this.dbDriver.raw(`SELECT c.reltuples::bigint AS count
+                  FROM   pg_class c
+                  JOIN   pg_namespace n ON n.oid = c.relnamespace
+                  WHERE  c.relname = ?
+                  AND    n.nspname = ?`, [this.tn,this.config?.searchPath?.[0] || 'public'])
+        ))?.rows?.[0];
+      }
+
       return await this._run(this.$db
         .conditionGraph(conditionGraph)
         .count(`${this.tn}.${(this.pks[0] || this.columns[0]).cn} as count`)
@@ -1103,7 +1117,7 @@ class BaseModelSql extends BaseModel {
             .select(this.dbModels[child].selectQuery(fields)) // ...fields.split(','));
 
 
-        this._paginateAndSort(query, {sort, limit, offset}, null,true);
+        this._paginateAndSort(query, {sort, limit, offset}, null, true);
         return this.isSqlite() ? this.dbDriver.select().from(query) : query;
       }), !this.isSqlite()
     ));
@@ -1370,7 +1384,7 @@ class BaseModelSql extends BaseModel {
    * @returns {Object} query appended with paginate and sort params
    * @private
    */
-  _paginateAndSort(query, {limit = 20, offset = 0, sort = ''}: XcFilter, table?: string, isUnion?:boolean) {
+  _paginateAndSort(query, {limit = 20, offset = 0, sort = ''}: XcFilter, table?: string, isUnion?: boolean) {
     query.offset(offset)
       .limit(limit);