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

@@ -214,8 +214,9 @@
           </template>
 
         </div>
+        <template v-if="data">
           <v-pagination
-          v-if="data && count !== Infinity"
+            v-if="count !== Infinity"
             style="max-width: 100%"
             v-model="page"
             :length="Math.ceil(count / size)"
@@ -223,7 +224,7 @@
             @input="loadTableData"
             color="primary lighten-2"
           ></v-pagination>
-        <div class="mx-auto d-flex align-center mt-n1 " style="max-width:250px">
+          <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"
@@ -236,10 +237,12 @@
               type="number"
             >
               <template #append>
-              <x-icon tooltip="Change page" small icon.class="mt-1" @click="loadTableData">mdi-keyboard-return</x-icon>
+                <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

@@ -252,7 +252,7 @@ class BaseModelSql extends BaseModel {
 
       const query = driver(this.tn).insert(insertObj);
 
-      if (this.dbDriver.clientType() === 'pg' || this.dbDriver.clientType() === 'mssql') {
+      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`)