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feat(cassandra): Enable case-sensitive support#25690

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imjalpreet merged 1 commit into
prestodb:masterfrom
bibith4:mixedcase_cassandra
Oct 8, 2025
Merged

feat(cassandra): Enable case-sensitive support#25690
imjalpreet merged 1 commit into
prestodb:masterfrom
bibith4:mixedcase_cassandra

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@bibith4

@bibith4 bibith4 commented Aug 5, 2025

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Description

Enable case sensitivity support in Cassandra connector

Motivation and Context

Cassandra connector always treated table and column names as lowercase. With this change, the connector can preserve case sensitivity, allowing the creation of tables and columns with the same name but different casing, depending on the configuration setting.

Impact

Supports creating tables and columns with the same name in different cases

Screenshot 2025-08-12 at 6 07 07 PM

Test Plan

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  • Please make sure your submission complies with our contributing guide, in particular code style and commit standards.
  • PR description addresses the issue accurately and concisely. If the change is non-trivial, a GitHub Issue is referenced.
  • Documented new properties (with its default value), SQL syntax, functions, or other functionality.
  • If release notes are required, they follow the release notes guidelines.
  • Adequate tests were added if applicable.
  • CI passed.

Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

Cassandra Connector Changes
* Add support for case-sensitive identifiers in Cassandra. It can be enabled by setting ``case-sensitive-name-matching=true`` configuration in the catalog configuration

@prestodb-ci prestodb-ci added the from:IBM PR from IBM label Aug 5, 2025
@agrawalreetika agrawalreetika changed the title [Do not review]Mixed case support for cassandra [Do not review] Case-sensitive support for cassandra Aug 6, 2025
@bibith4 bibith4 force-pushed the mixedcase_cassandra branch 5 times, most recently from 44c3dcc to 73ec9cd Compare August 11, 2025 15:46
@bibith4 bibith4 marked this pull request as ready for review August 12, 2025 07:10
@bibith4 bibith4 requested a review from a team as a code owner August 12, 2025 07:10
@prestodb-ci prestodb-ci requested review from a team, BryanCutler and ScrapCodes and removed request for a team August 12, 2025 07:10
@bibith4 bibith4 requested a review from agrawalreetika August 12, 2025 07:10
@bibith4 bibith4 changed the title [Do not review] Case-sensitive support for cassandra Case-sensitive support for cassandra Aug 12, 2025

@agrawalreetika agrawalreetika left a comment

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Thanks for making the changes and adding the support.
I think currently, schemas are still getting converted to lowercase? https://github.com/bibith4/presto/blob/73ec9cd4a49982120eb3af5e781a943baf755205/presto-cassandra/src/main/java/com/facebook/presto/cassandra/CassandraMetadata.java#L101

Please verify and make the changes along with the tests accordingly.

@bibith4 bibith4 force-pushed the mixedcase_cassandra branch 3 times, most recently from 5dd62cf to c81c097 Compare August 13, 2025 10:08
@bibith4

bibith4 commented Aug 13, 2025

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Thanks for making the changes and adding the support. I think currently, schemas are still getting converted to lowercase? https://github.com/bibith4/presto/blob/73ec9cd4a49982120eb3af5e781a943baf755205/presto-cassandra/src/main/java/com/facebook/presto/cassandra/CassandraMetadata.java#L101

Please verify and make the changes along with the tests accordingly.

@agrawalreetika Added the requested changes. Please check

@bibith4 bibith4 requested a review from agrawalreetika August 13, 2025 10:09
session.execute("CREATE KEYSPACE test_keyspace WITH REPLICATION = {'class':'SimpleStrategy', 'replication_factor': 1}");
assertContainsEventually(() -> getQueryRunner().execute("SHOW SCHEMAS FROM cassandra"), resultBuilder(getSession(), createUnboundedVarcharType())
.row("test_keyspace")
.build(), new Duration(1, MINUTES));

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Lets add schema creation for same KEYSPACE in upper case as well and then check for lowercase and upper cae for in testShowSchemas

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Please add the documenation details as well for new config - https://prestodb.io/docs/current/connector/cassandra.html#configuration-properties

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Please add the documenation details as well for new config - https://prestodb.io/docs/current/connector/cassandra.html#configuration-properties

Yes, please add documentation. You can use the MySQL doc as a model where the case-sensitive-name-matching property is documented in the last row of the table.

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@agrawalreetika @steveburnett updated the document with new config property. Please check

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Lets add schema creation for same KEYSPACE in upper case as well and then check for lowercase and upper cae for in testShowSchemas

@agrawalreetika Added the required changes. Please check

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Thanks for the docs! Minor nits.

Comment thread presto-docs/src/main/sphinx/connector/cassandra.rst Outdated
Comment thread presto-docs/src/main/sphinx/connector/cassandra.rst Outdated
@bibith4 bibith4 force-pushed the mixedcase_cassandra branch from 6b547ef to 58971f4 Compare August 18, 2025 15:10
@bibith4 bibith4 requested a review from steveburnett August 18, 2025 15:12
steveburnett
steveburnett previously approved these changes Aug 18, 2025

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LGTM! (docs)

Pull updated branch, new local doc build, looks good. Thanks!

agrawalreetika
agrawalreetika previously approved these changes Sep 2, 2025
@bibith4

bibith4 commented Sep 2, 2025

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@jaystarshot Could you please review this?
There is a CI check for the profile test-cassandra-integration-smoke-test please remove it.
I have created a new profile ci-full-tests to run all tests, replacing test-cassandra-integration-smoke-test

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Thanks, @bibith4. I had a first look and have a few suggestions/clarifications.

Overall, I have one question. In the NativeCassandraSession class, I still see some case-insensitive matching for schema names present. Is that expected? If not, we should fix that.

private KeyspaceMetadata getKeyspaceByCaseInsensitiveName(String caseInsensitiveSchemaName)
throws SchemaNotFoundException
{
try {
return keyspaceCache.get(caseInsensitiveSchemaName);
}
catch (UncheckedExecutionException | ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof SchemaNotFoundException) {
throw (SchemaNotFoundException) cause;
}
if (cause instanceof PrestoException) {
throw (PrestoException) cause;
}
throw new RuntimeException(cause);
}
}
private KeyspaceMetadata getKeyspaceByCaseInsensitiveName0(String caseInsensitiveSchemaName)
throws SchemaNotFoundException
{
List<KeyspaceMetadata> keyspaces = executeWithSession(session -> session.getCluster().getMetadata().getKeyspaces());
KeyspaceMetadata result = null;
// Ensure that the error message is deterministic
List<KeyspaceMetadata> sortedKeyspaces = Ordering.from(comparing(KeyspaceMetadata::getName)).immutableSortedCopy(keyspaces);
for (KeyspaceMetadata keyspace : sortedKeyspaces) {
if (keyspace.getName().equalsIgnoreCase(caseInsensitiveSchemaName)) {
if (result != null) {
throw new PrestoException(
NOT_SUPPORTED,
format("More than one keyspace has been found for the case insensitive schema name: %s -> (%s, %s)",
caseInsensitiveSchemaName, result.getName(), keyspace.getName()));
}
result = keyspace;
}
}
if (result == null) {
throw new SchemaNotFoundException(caseInsensitiveSchemaName);
}
return result;
}

keyspace.getTables().stream(),
keyspace.getMaterializedViews().stream())
.filter(table -> table.getName().equalsIgnoreCase(caseInsensitiveTableName))
.filter(table -> caseSensitiveNameMatchingEnabled ? table.getName().equals(caseInsensitiveTableName) : table.getName().equalsIgnoreCase(caseInsensitiveTableName))

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The variable name caseInsensitiveTableName is confusing and doesn't sound accurate now. I am assuming it will not be case-insensitive, only then can we match it case-sensitively. Please update it accordingly wherever it is used.

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Updated the variable name. Please check


private static void checkColumnNames(List<ColumnMetadata> columns)
{
Map<String, ColumnMetadata> lowercaseNameToColumnMap = new HashMap<>();

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Same here, we need to update the map name, it is not just lowercaseNameToColumnMap anymore.

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updated the variable name . Please check

@bibith4

bibith4 commented Sep 9, 2025

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Thanks, @bibith4. I had a first look and have a few suggestions/clarifications.

Overall, I have one question. In the NativeCassandraSession class, I still see some case-insensitive matching for schema names present. Is that expected? If not, we should fix that.

private KeyspaceMetadata getKeyspaceByCaseInsensitiveName(String caseInsensitiveSchemaName)
throws SchemaNotFoundException
{
try {
return keyspaceCache.get(caseInsensitiveSchemaName);
}
catch (UncheckedExecutionException | ExecutionException e) {
Throwable cause = e.getCause();
if (cause instanceof SchemaNotFoundException) {
throw (SchemaNotFoundException) cause;
}
if (cause instanceof PrestoException) {
throw (PrestoException) cause;
}
throw new RuntimeException(cause);
}
}
private KeyspaceMetadata getKeyspaceByCaseInsensitiveName0(String caseInsensitiveSchemaName)
throws SchemaNotFoundException
{
List<KeyspaceMetadata> keyspaces = executeWithSession(session -> session.getCluster().getMetadata().getKeyspaces());
KeyspaceMetadata result = null;
// Ensure that the error message is deterministic
List<KeyspaceMetadata> sortedKeyspaces = Ordering.from(comparing(KeyspaceMetadata::getName)).immutableSortedCopy(keyspaces);
for (KeyspaceMetadata keyspace : sortedKeyspaces) {
if (keyspace.getName().equalsIgnoreCase(caseInsensitiveSchemaName)) {
if (result != null) {
throw new PrestoException(
NOT_SUPPORTED,
format("More than one keyspace has been found for the case insensitive schema name: %s -> (%s, %s)",
caseInsensitiveSchemaName, result.getName(), keyspace.getName()));
}
result = keyspace;
}
}
if (result == null) {
throw new SchemaNotFoundException(caseInsensitiveSchemaName);
}
return result;
}

@imjalpreet Updated the logic to support case sensitivity for schemas as well. Please check

@bibith4 bibith4 requested a review from imjalpreet September 9, 2025 11:44

@imjalpreet imjalpreet left a comment

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@bibith4, some changes appear to be in the wrong commit. Please check and update the commits to include only relevant changes. It would really help in the review process. Thank you!

@bibith4

bibith4 commented Sep 11, 2025

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@bibith4, some changes appear to be in the wrong commit. Please check and update the commits to include only relevant changes. It would really help in the review process. Thank you!

@imjalpreet As discussed created a seperate PR for Enable and fix all Cassandra connector tests in CI(#26022 (comment)).

@bibith4 bibith4 force-pushed the mixedcase_cassandra branch 3 times, most recently from aa7e9d7 to a1fbb34 Compare September 18, 2025 06:43
@bibith4

bibith4 commented Sep 18, 2025

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@imjalpreet Updated the PR to include only mixed-case support for the Cassandra change. Can you please take a look.

@bibith4 bibith4 requested a review from imjalpreet September 18, 2025 07:29
session.execute("DROP KEYSPACE keyspace_1");
}
}
}

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@bibith4 Can you add a test method for ALTER operations as well?

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@agrawalreetika Cassandra does not support ALTER operations

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Thanks, @bibith4.

try {
for (String tableName : cassandraSession.getCaseSensitiveTableNames(schemaName)) {
tableNames.add(new SchemaTableName(schemaName, tableName.toLowerCase(ENGLISH)));
String finalTableName = normalizeIdentifier(session, tableName);

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nit:

Suggested change
String finalTableName = normalizeIdentifier(session, tableName);
String normalizedTableName = normalizeIdentifier(session, tableName);

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@imjalpreet Changed as per suggestion. Please check

for (CassandraColumnHandle columnHandle : table.getColumns()) {
columnHandles.put(CassandraCqlUtils.cqlNameToSqlName(columnHandle.getName()).toLowerCase(ENGLISH), columnHandle);
String columnName = CassandraCqlUtils.cqlNameToSqlName(columnHandle.getName());
String finalColumnName = normalizeIdentifier(session, columnName);

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Suggested change
String finalColumnName = normalizeIdentifier(session, columnName);
String normalizedColumnName = normalizeIdentifier(session, columnName);

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@imjalpreet Changed as per suggestion. Please check

ImmutableMap.Builder<String, ColumnHandle> columnHandles = ImmutableMap.builder();
for (CassandraColumnHandle columnHandle : table.getColumns()) {
columnHandles.put(CassandraCqlUtils.cqlNameToSqlName(columnHandle.getName()).toLowerCase(ENGLISH), columnHandle);
String columnName = CassandraCqlUtils.cqlNameToSqlName(columnHandle.getName());

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nit: static import for cqlNameToSqlName

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@imjalpreet Changed as per suggestion. Please check

Comment on lines 305 to 310
if (result != null) {
throw new PrestoException(
NOT_SUPPORTED,
format("More than one keyspace has been found for the case insensitive schema name: %s -> (%s, %s)",
caseInsensitiveSchemaName, result.getName(), keyspace.getName()));
format("More than one keyspace has been found for the schema name: %s -> (%s, %s)",
caseSensitiveSchemaName, result.getName(), keyspace.getName()));
}

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Do we need this check when caseSensitiveNameMatchingEnabled is true? I think it can only happen if we match case-insensitively.

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@imjalpreet Changed to check only if caseSensitiveNameMatchingEnabled is false

keyspace.getTables().stream(),
keyspace.getMaterializedViews().stream())
.filter(table -> table.getName().equalsIgnoreCase(caseInsensitiveTableName))
.filter(table -> caseSensitiveNameMatchingEnabled ? table.getName().equals(caseSensitiveTableName) : table.getName().equalsIgnoreCase(caseSensitiveTableName))

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nit: maybe we can make the matchesSchemaName method generic and use it for both table and schema checks.

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@imjalpreet Changed to make the method generic

Comment on lines +362 to +366
if (columnMap.containsKey(columnNameKey)) {
throw new PrestoException(
NOT_SUPPORTED,
format("More than one column has been found for the case insensitive column name: %s -> (%s, %s)",
lowercaseName, lowercaseNameToColumnMap.get(lowercaseName).getName(), column.getName()));
columnNameKey, columnMap.get(columnNameKey).getName(), column.getName()));

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Same question here. Do we need this when caseSensitiveNameMatchingEnabled is true?

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@imjalpreet Changed to check only if caseSensitiveNameMatchingEnabled is false

{
private CassandraServer server;
private CassandraSession session;
private static final String KEYSPACE = "test_connetor";

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Suggested change
private static final String KEYSPACE = "test_connetor";
private static final String KEYSPACE = "test_connector";

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@imjalpreet Corrected. Please check

Comment on lines +101 to +102
assertQueryFails("CREATE TABLE test_connector.TEST_CREATEAS_FAIL_Join AS SELECT c.custkey, o.orderkey FROM " +
"tpch.customer c INNER JOIN tpch.ORDERS1 o ON c.custkey = o.custkey WHERE c.mktsegment = 'BUILDING'", "Table cassandra.tpch.ORDERS1 does not exist"); //failure scenario since tpch.ORDERS1 doesn't exist

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What is the significance of this test? Shouldn't we test with just ORDERS rather than ORDERS1 as lowercase orders exists?

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@imjalpreet Corrected to use ORDERS. Please check

"tpch.customer Cus INNER JOIN tpch.orders Ord ON Cus.custkey = Ord.custkey WHERE Cus.mktsegment = 'BUILDING'");
assertTrue(getQueryRunner().tableExists(session, "Test_CreateAs_Mixed_Join"));
}
finally {

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nit: you missed dropping TEST_CREATEAS_Join

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@imjalpreet added drop statement for TEST_CREATEAS_Join

assertQuery("SELECT COUNT(*) FROM test_connetor.test_select", "VALUES 2");
}
finally {
getQueryRunner().execute(session, "DROP TABLE IF EXISTS TEST_SELECT");

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We created lowercase TEST_SELECT

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@imjalpreet Corrected. Please check

@bibith4 bibith4 force-pushed the mixedcase_cassandra branch from a1fbb34 to 6dfb570 Compare September 19, 2025 10:34

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Thank you, @bibith4.

Changes LGTM now, last few nits.

format("More than one keyspace has been found for the case insensitive schema name: %s -> (%s, %s)",
caseInsensitiveSchemaName, result.getName(), keyspace.getName()));
format("More than one keyspace has been found for the schema name: %s -> (%s, %s)",
caseSensitiveSchemaName, result.getName(), keyspace.getName()));

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nit: I think we should print the lowercased schema name in the error message

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@imjalpreet Corrected. Please check

format("More than one table has been found for the case insensitive table name: %s -> (%s)",
caseInsensitiveTableName, tableNames));
caseSensitiveTableName, tableNames));
}

@imjalpreet imjalpreet Sep 19, 2025

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Missed this the last time, similar to schema and column names, this is also only needed when caseSensitiveNameMatchingEnabled is false

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Sorry, ignore this. Its already handled.

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But print the lowercased table name in error message

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@imjalpreet Corrected. Please check

private static void checkColumnNames(List<ColumnMetadata> columns)
{
Map<String, ColumnMetadata> lowercaseNameToColumnMap = new HashMap<>();
Map<String, ColumnMetadata> columnMap = new HashMap<>();

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nit: maybe this line change can now be reverted

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@imjalpreet Corrected. Please check

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Thank you, @bibith4.

LGTM.

Comment on lines +47 to +51
connectorProperties = new HashMap<>(ImmutableMap.copyOf(connectorProperties));
connectorProperties.putIfAbsent("cassandra.contact-points", server.getHost());
connectorProperties.putIfAbsent("cassandra.native-protocol-port", Integer.toString(server.getPort()));
connectorProperties.putIfAbsent("cassandra.allow-drop-table", "true");

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Are these related to the case sensitivity changes?

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These were already being used. The change is to add them to the newly introduced connectorProperties map.

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