fix: Unnecessary migrations for fulltext indices

src/driver/Driver.ts

@@ -193,6 +193,11 @@ export interface Driver {
      */
     isUUIDGenerationSupported(): boolean;
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean;
+
     /**
      * Creates an escaped parameter.
      */

src/driver/aurora-data-api/AuroraDataApiDriver.ts

@@ -750,6 +750,13 @@ export class AuroraDataApiDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return true;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/cockroachdb/CockroachDriver.ts

@@ -649,6 +649,13 @@ export class CockroachDriver implements Driver {
         return true;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/mongodb/MongoDriver.ts

@@ -389,6 +389,13 @@ export class MongoDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/mysql/MysqlDriver.ts

@@ -798,6 +798,13 @@ export class MysqlDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return true;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/oracle/OracleDriver.ts

@@ -623,6 +623,13 @@ export class OracleDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/postgres/PostgresDriver.ts

@@ -912,6 +912,13 @@ export class PostgresDriver implements Driver {
         return true;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     get uuidGenerator(): string {
         return this.options.uuidExtension === "pgcrypto" ? "gen_random_uuid()" : "uuid_generate_v4()";
     }

src/driver/sap/SapDriver.ts

@@ -624,6 +624,13 @@ export class SapDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return true;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/sqlite-abstract/AbstractSqliteDriver.ts

@@ -575,6 +575,13 @@ export abstract class AbstractSqliteDriver implements Driver {
         return false;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/driver/sqlserver/SqlServerDriver.ts

@@ -640,6 +640,13 @@ export class SqlServerDriver implements Driver {
         return true;
     }
 
+    /**
+     * Returns true if driver supports fulltext indices.
+     */
+    isFullTextColumnTypeSupported(): boolean {
+        return false;
+    }
+
     /**
      * Creates an escaped parameter.
      */

src/schema-builder/RdbmsSchemaBuilder.ts

@@ -277,7 +277,7 @@ export class RdbmsSchemaBuilder implements SchemaBuilder {
                         if (indexMetadata.isSpatial !== tableIndex.isSpatial)
                             return true;
 
-                        if (indexMetadata.isFulltext !== tableIndex.isFulltext)
+                        if (this.connection.driver.isFullTextColumnTypeSupported() && indexMetadata.isFulltext !== tableIndex.isFulltext)
                             return true;
 
                         if (indexMetadata.columns.length !== tableIndex.columnNames.length)

src/schema-builder/options/TableIndexOptions.ts

@@ -30,10 +30,10 @@ export interface TableIndexOptions {
 
     /**
      * The FULLTEXT modifier indexes the entire column and does not allow prefixing.
-     * Works only in MySQL.
+     * Supported only in MySQL & SAP HANA.
      */
     isFulltext?: boolean;
-    
+
     /**
      * Fulltext parser.
      * Works only in MySQL.
@@ -45,4 +45,4 @@ export interface TableIndexOptions {
      */
     where?: string;
 
-}
+}

test/github-issues/6633/entity/Test.ts

@@ -0,0 +1,11 @@
+import { Entity, PrimaryColumn, Index, Column } from "../../../../src";
+
+@Entity()
+export class Test {
+    @PrimaryColumn()
+    id: number;
+
+    @Index("description_index", { fulltext: true })
+    @Column()
+    description: string;
+}

test/github-issues/6633/issue-6633.ts

@@ -0,0 +1,29 @@
+import "reflect-metadata";
+import { expect } from "chai";
+import { Connection } from "../../../src";
+import { closeTestingConnections, createTestingConnections, reloadTestingDatabases } from "../../utils/test-utils";
+import { Post } from "../4440/entity/Post";
+
+describe("github issues > #6633 Fulltext indices continually dropped & re-created", () => {
+
+    let connections: Connection[];
+    before(async () => {
+        connections = await createTestingConnections({
+            entities: [Post],
+            schemaCreate: true,
+            dropSchema: true
+        });
+    });
+    beforeEach(() => reloadTestingDatabases(connections));
+    after(() => closeTestingConnections(connections));
+
+    it("should not create migrations for fulltext indices", () =>
+        Promise.all(connections.map(async (connection) => {
+                const sqlInMemory = await connection.driver.createSchemaBuilder().log();
+
+                expect(sqlInMemory.upQueries).to.eql([]);
+                expect(sqlInMemory.downQueries).to.eql([]);
+            }
+        ))
+    );
+});