SNOW-1729292 modify iceberg tree based on record data

src/main/java/com/snowflake/kafka/connector/internal/SnowflakeConnectionService.java

@@ -112,6 +112,14 @@ public interface SnowflakeConnectionService {
    */
   void appendColumnsToTable(String tableName, Map<String, ColumnInfos> columnInfosMap);
 
+  /**
+   * Alter iceberg table to modify columns datatype
+   *
+   * @param tableName the name of the table
+   * @param columnInfosMap the mapping from the columnNames to their columnInfos
+   */
+  void alterColumnsDataTypeIcebergTable(String tableName, Map<String, ColumnInfos> columnInfosMap);
+
   /**
    * Alter iceberg table to add columns according to a map from columnNames to their types
    *

src/main/java/com/snowflake/kafka/connector/internal/SnowflakeConnectionServiceV1.java

@@ -30,6 +30,7 @@
 import java.util.Optional;
 import java.util.Properties;
 import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
 import net.snowflake.client.jdbc.SnowflakeConnectionV1;
 import net.snowflake.client.jdbc.SnowflakeDriver;
 import net.snowflake.client.jdbc.cloud.storage.StageInfo;
@@ -498,6 +499,39 @@ public boolean hasSchemaEvolutionPermission(String tableName, String role) {
     return hasPermission;
   }
 
+  /**
+   * Alter iceberg table to modify columns datatype
+   *
+   * @param tableName the name of the table
+   * @param columnInfosMap the mapping from the columnNames to their infos
+   */
+  @Override
+  public void alterColumnsDataTypeIcebergTable(
+      String tableName, Map<String, ColumnInfos> columnInfosMap) {
+    LOGGER.debug("Modifying data types of iceberg table columns");
+    String alterSetDatatypeQuery = generateAlterSetDataTypeQuery(columnInfosMap);
+    executeStatement(tableName, alterSetDatatypeQuery);
+  }
+
+  private String generateAlterSetDataTypeQuery(Map<String, ColumnInfos> columnsToModify) {
+    StringBuilder setDataTypeQuery = new StringBuilder("alter iceberg ");
+    setDataTypeQuery.append("table identifier(?) alter column ");
+
+    String columnsPart =
+        columnsToModify.entrySet().stream()
+            .map(
+                column -> {
+                  String columnName = column.getKey();
+                  String dataType = column.getValue().getColumnType();
+                  return columnName + " set data type " + dataType;
+                })
+            .collect(Collectors.joining(", "));
+
+    setDataTypeQuery.append(columnsPart);
+
+    return setDataTypeQuery.toString();
+  }
+
   /**
    * Alter table to add columns according to a map from columnNames to their types
    *
@@ -552,18 +586,22 @@ private void appendColumnsToTable(
       logColumn.append(columnName).append(" (").append(columnInfosMap.get(columnName)).append(")");
     }
 
+    executeStatement(tableName, appendColumnQuery.toString());
+
+    logColumn.insert(0, "Following columns created for table {}:\n").append("]");
+    LOGGER.info(logColumn.toString(), tableName);
+  }
+
+  private void executeStatement(String tableName, String query) {
     try {
-      LOGGER.info("Trying to run query: {}", appendColumnQuery.toString());
-      PreparedStatement stmt = conn.prepareStatement(appendColumnQuery.toString());
+      LOGGER.info("Trying to run query: {}", query);
+      PreparedStatement stmt = conn.prepareStatement(query);
       stmt.setString(1, tableName);
       stmt.execute();
       stmt.close();
     } catch (SQLException e) {
       throw SnowflakeErrors.ERROR_2015.getException(e);
     }
-
-    logColumn.insert(0, "Following columns created for table {}:\n").append("]");
-    LOGGER.info(logColumn.toString(), tableName);
   }
 
   /**

src/main/java/com/snowflake/kafka/connector/internal/SnowflakeErrors.java

@@ -339,7 +339,8 @@ public enum SnowflakeErrors {
       "Timeout while waiting for file cleaner to start",
       "Could not allocate thread for file cleaner to start processing in given time. If problem"
           + " persists, please try setting snowflake.snowpipe.use_new_cleaner to false"),
-  ;
+  ERROR_5025(
+      "5025", "Unexpected data type", "Unexpected data type encountered during schema evolution.");
 
   // properties
 

src/main/java/com/snowflake/kafka/connector/internal/streaming/BufferedTopicPartitionChannel.java

@@ -684,7 +684,8 @@ public InsertRowsResponse get() throws Throwable {
               LOGGER.info("Triggering schema evolution. Items: {}", schemaEvolutionTargetItems);
               schemaEvolutionService.evolveSchemaIfNeeded(
                   schemaEvolutionTargetItems,
-                  this.insertRowsStreamingBuffer.getSinkRecord(originalSinkRecordIdx));
+                  this.insertRowsStreamingBuffer.getSinkRecord(originalSinkRecordIdx),
+                  channel.getTableSchema());
               // Offset reset needed since it's possible that we successfully ingested partial batch
               needToResetOffset = true;
               break;

src/main/java/com/snowflake/kafka/connector/internal/streaming/DirectTopicPartitionChannel.java

@@ -51,10 +51,7 @@
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.atomic.AtomicLong;
-import net.snowflake.ingest.streaming.InsertValidationResponse;
-import net.snowflake.ingest.streaming.OpenChannelRequest;
-import net.snowflake.ingest.streaming.SnowflakeStreamingIngestChannel;
-import net.snowflake.ingest.streaming.SnowflakeStreamingIngestClient;
+import net.snowflake.ingest.streaming.*;
 import net.snowflake.ingest.utils.SFException;
 import org.apache.kafka.common.TopicPartition;
 import org.apache.kafka.connect.data.Schema;
@@ -539,7 +536,8 @@ private void handleInsertRowFailure(
       SchemaEvolutionTargetItems schemaEvolutionTargetItems =
           insertErrorMapper.mapToSchemaEvolutionItems(insertError, this.channel.getTableName());
       if (schemaEvolutionTargetItems.hasDataForSchemaEvolution()) {
-        schemaEvolutionService.evolveSchemaIfNeeded(schemaEvolutionTargetItems, kafkaSinkRecord);
+        schemaEvolutionService.evolveSchemaIfNeeded(
+            schemaEvolutionTargetItems, kafkaSinkRecord, channel.getTableSchema());
         streamingApiFallbackSupplier(
             StreamingApiFallbackInvoker.INSERT_ROWS_SCHEMA_EVOLUTION_FALLBACK);
         return;

src/main/java/com/snowflake/kafka/connector/internal/streaming/schemaevolution/SchemaEvolutionService.java

@@ -1,5 +1,7 @@
 package com.snowflake.kafka.connector.internal.streaming.schemaevolution;
 
+import java.util.Map;
+import net.snowflake.ingest.streaming.internal.ColumnProperties;
 import org.apache.kafka.connect.sink.SinkRecord;
 
 public interface SchemaEvolutionService {
@@ -11,6 +13,10 @@ public interface SchemaEvolutionService {
    * @param targetItems target items for schema evolution such as table name, columns to drop
    *     nullability, and columns to add
    * @param record the sink record that contains the schema and actual data
+   * @param existingSchema schema stored in a channel
    */
-  void evolveSchemaIfNeeded(SchemaEvolutionTargetItems targetItems, SinkRecord record);
+  void evolveSchemaIfNeeded(
+      SchemaEvolutionTargetItems targetItems,
+      SinkRecord record,
+      Map<String, ColumnProperties> existingSchema);
 }

src/main/java/com/snowflake/kafka/connector/internal/streaming/schemaevolution/iceberg/IcebergColumnJsonValuePair.java

@@ -0,0 +1,26 @@
+package com.snowflake.kafka.connector.internal.streaming.schemaevolution.iceberg;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import java.util.Map;
+
+class IcebergColumnJsonValuePair {
+  private final String columnName;
+  private final JsonNode jsonNode;
+
+  static IcebergColumnJsonValuePair from(Map.Entry<String, JsonNode> field) {
+    return new IcebergColumnJsonValuePair(field.getKey(), field.getValue());
+  }
+
+  IcebergColumnJsonValuePair(String columnName, JsonNode jsonNode) {
+    this.columnName = columnName;
+    this.jsonNode = jsonNode;
+  }
+
+  String getColumnName() {
+    return columnName;
+  }
+
+  JsonNode getJsonNode() {
+    return jsonNode;
+  }
+}

src/main/java/com/snowflake/kafka/connector/internal/streaming/schemaevolution/iceberg/ApacheIcebergColumnSchema.java → src/main/java/com/snowflake/kafka/connector/internal/streaming/schemaevolution/iceberg/IcebergColumnSchema.java

@@ -3,22 +3,22 @@
 import org.apache.iceberg.types.Type;
 
 /** Wrapper class for Iceberg schema retrieved from channel. */
-public class ApacheIcebergColumnSchema {
+class IcebergColumnSchema {
 
   private final Type schema;
 
   private final String columnName;
 
-  public ApacheIcebergColumnSchema(Type schema, String columnName) {
+  IcebergColumnSchema(Type schema, String columnName) {
     this.schema = schema;
-    this.columnName = columnName.toUpperCase();
+    this.columnName = columnName;
   }
 
-  public Type getSchema() {
+  Type getSchema() {
     return schema;
   }
 
-  public String getColumnName() {
+  String getColumnName() {
     return columnName;
   }
 }

src/main/java/com/snowflake/kafka/connector/internal/streaming/schemaevolution/iceberg/IcebergColumnTree.java

@@ -1,16 +1,19 @@
 package com.snowflake.kafka.connector.internal.streaming.schemaevolution.iceberg;
 
 /** Class with object types compatible with Snowflake Iceberg table */
-public class IcebergColumnTree {
+class IcebergColumnTree {
 
   private final IcebergFieldNode rootNode;
 
-  public IcebergColumnTree(ApacheIcebergColumnSchema columnSchema) {
-    this.rootNode = new IcebergFieldNode(columnSchema.getColumnName(), columnSchema.getSchema());
+  String getColumnName() {
+    return rootNode.name;
   }
 
-  public String buildQuery() {
-    StringBuilder sb = new StringBuilder();
-    return rootNode.buildQuery(sb, "ROOT_NODE").toString();
+  IcebergFieldNode getRootNode() {
+    return rootNode;
+  }
+
+  IcebergColumnTree(IcebergFieldNode rootNode) {
+    this.rootNode = rootNode;
   }
 }