Fixes case sensitivity for snowflake to be default and env driven

Adds env var for the snowflake driver to enable or disable the
case sensitivity and if not set will default to case insensitive

Author: mike-taylor-nomihealth

packages/cubejs-backend-shared/src/env.ts

@@ -1478,6 +1478,39 @@ const variables: Record<string, (...args: any) => any> = {
     ]
   ),
 
+  /**
+   * Snowflake case sensitivity for identifiers (like database columns).
+   */
+  snowflakeQuotedIdentIgnoreCase: ({
+    dataSource
+  }: {
+    dataSource: string,
+  }) => {
+    const val = process.env[
+      keyByDataSource(
+        'CUBEJS_DB_SNOWFLAKE_QUOTED_IDENTIFIERS_IGNORE_CASE',
+        dataSource,
+      )
+    ];
+    if (val) {
+      if (val.toLocaleLowerCase() === 'true') {
+        return true;
+      } else if (val.toLowerCase() === 'false') {
+        return false;
+      } else {
+        throw new TypeError(
+          `The ${
+            keyByDataSource(
+              'CUBEJS_DB_SNOWFLAKE_QUOTED_IDENTIFIERS_IGNORE_CASE',
+              dataSource,
+            )
+          } must be either 'true' or 'false'.`
+        );
+      }
+    } else {
+      return true;
+    }
+  },
   /** ****************************************************************
    * Presto Driver                                                   *
    ***************************************************************** */

packages/cubejs-snowflake-driver/src/SnowflakeDriver.ts

@@ -173,6 +173,7 @@ interface SnowflakeDriverOptions {
   resultPrefetch?: number,
   exportBucket?: SnowflakeDriverExportBucket,
   executionTimeout?: number,
+  caseSensitiveIdentifiers?: boolean,
   application: string,
   readOnly?: boolean,
 
@@ -213,6 +214,7 @@ export class SnowflakeDriver extends BaseDriver implements DriverInterface {
       'CUBEJS_DB_SNOWFLAKE_PRIVATE_KEY_PATH',
       'CUBEJS_DB_SNOWFLAKE_PRIVATE_KEY_PASS',
       'CUBEJS_DB_SNOWFLAKE_OAUTH_TOKEN_PATH',
+      'CUBEJS_DB_SNOWFLAKE_QUOTED_IDENTIFIRS_IGNORE_CASE',
     ];
   }
 
@@ -279,6 +281,7 @@ export class SnowflakeDriver extends BaseDriver implements DriverInterface {
       exportBucket: this.getExportBucket(dataSource),
       resultPrefetch: 1,
       executionTimeout: getEnv('dbQueryTimeout', { dataSource }),
+      ignoreCase: getEnv('snowflakeQuotedIdentIgnoreCase', { dataSource }),
       exportBucketCsvEscapeSymbol: getEnv('dbExportBucketCsvEscapeSymbol', { dataSource }),
       application: 'CubeDev_Cube',
       ...config
@@ -450,8 +453,9 @@ export class SnowflakeDriver extends BaseDriver implements DriverInterface {
 
       await this.execute(connection, 'ALTER SESSION SET TIMEZONE = \'UTC\'', [], false);
       await this.execute(connection, `ALTER SESSION SET STATEMENT_TIMEOUT_IN_SECONDS = ${this.config.executionTimeout}`, [], false);
-      await this.execute(connection, 'ALTER SESSION SET QUOTED_IDENTIFIRS_IGNORE_CASE = FALSE', [], false);
-
+      if (this.ignoreCase) {
+        await this.execute(connection, 'ALTER SESSION SET QUOTED_IDENTIFIERS_IGNORE_CASE = FALSE', [], false);
+      }
       return connection;
     } catch (e) {
       this.connection = null;