feat: add ISBLANK and ISNOTBLANK formula support

packages/noco-docs/docs/070.fields/040.field-types/060.formula/030.string-functions.md

@@ -237,6 +237,36 @@ URLENCODE(text)
 => 'https://example.com/q?param=Hello%2C%20world'
 ```
 
+## ISBLANK
+
+The ISBLANK function checks if the input string is empty or null and returns a boolean value.
+
+#### Syntax
+```plaintext
+ISBLANK(text)
+```
+
+#### Sample
+```plaintext
+ISBLANK('') => true
+ISBLANK('Hello') => false
+```
+
+## ISNONBLANK
+
+The ISNONBLANK function checks if the input string is not empty or null and returns a boolean value.
+
+#### Syntax
+```plaintext
+ISNONBLANK(text)
+```
+
+#### Sample
+```plaintext
+ISNONBLANK('') => false
+ISNONBLANK('Hello') => true
+```
+
 
 ## Related Articles
 - [Numeric and Logical Operators](015.operators.md)

packages/nocodb-sdk/src/lib/formulaHelpers.ts

@@ -961,6 +961,36 @@ export const formulas: Record<string, FormulaMeta> = {
     examples: ['MID("NocoDB", 3, 2) => "co"', 'MID({column1}, 3, 2)'],
     returnType: FormulaDataTypes.STRING,
   },
+  ISBLANK: {
+    docsUrl:
+      'https://docs.nocodb.com/fields/field-types/formula/string-functions#isblank',
+
+    validation: {
+      args: {
+        rqd: 1,
+        type: [FormulaDataTypes.UNKNOWN],
+      },
+    },
+    description: 'Check if the input parameter is blank.',
+    syntax: 'ISBLANK(value)',
+    examples: ['ISBLANK({column1}) => false', 'ISBLANK("") => true'],
+    returnType: FormulaDataTypes.BOOLEAN,
+  },
+  ISNOTBLANK: {
+    docsUrl:
+      'https://docs.nocodb.com/fields/field-types/formula/string-functions#isnotblank',
+
+    validation: {
+      args: {
+        rqd: 1,
+        type: [FormulaDataTypes.UNKNOWN],
+      },
+    },
+    description: 'Check if the input parameter is not blank.',
+    syntax: 'ISNOTBLANK(value)',
+    examples: ['ISNOTBLANK({column1}) => true', 'ISNOTBLANK("") => false'],
+    returnType: FormulaDataTypes.BOOLEAN,
+  },
   IF: {
     docsUrl:
       'https://docs.nocodb.com/fields/field-types/formula/conditional-expressions#if',

packages/nocodb/src/db/functionMappings/commonFns.ts

@@ -354,10 +354,18 @@ export default {
   },
   ISBLANK: async ({ fn, knex, pt, colAlias }: MapFnArgs) => {
     const { builder: valueBuilder } = await fn(pt.arguments[0]);
+    const { builder: stringValueBuilder } = await fn({
+      type: 'CallExpression',
+      arguments: [pt.arguments[0]],
+      callee: {
+        type: 'Identifier',
+        name: 'STRING',
+      },
+    });
 
     return {
       builder: knex.raw(
-        `(${valueBuilder} IS NULL OR ${valueBuilder} = '')${colAlias}`,
+        `(${valueBuilder} IS NULL OR ${stringValueBuilder} = '')${colAlias}`,
       ),
     };
   },
@@ -370,10 +378,17 @@ export default {
   },
   ISNOTBLANK: async ({ fn, knex, pt, colAlias }: MapFnArgs) => {
     const { builder: valueBuilder } = await fn(pt.arguments[0]);
-
+    const { builder: stringValueBuilder } = await fn({
+      type: 'CallExpression',
+      arguments: [pt.arguments[0]],
+      callee: {
+        type: 'Identifier',
+        name: 'STRING',
+      },
+    });
     return {
       builder: knex.raw(
-        `(${valueBuilder} IS NOT NULL AND ${valueBuilder} != '')${colAlias}`,
+        `(${valueBuilder} IS NOT NULL AND ${stringValueBuilder} != '')${colAlias}`,
       ),
     };
   },