[🍒 ] Add defaults for Time and Range Partitioning in BQ source plugin

docs/BigQueryTable-batchsource.md

@@ -57,6 +57,14 @@ name is not null', all output rows will have an 'age' over 50 and a value for th
 This is the same as the WHERE clause in BigQuery. More information can be found at
 https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#where_clause
 
+**Order By**: The column or list of columns to order the data by. For
+example, `name asc, age desc`. More information can be found
+at https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#order_by_clause.
+
+**Limit**: The maximum number of rows to read from the source table. More information can be
+found
+at https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#limit_and_offset_clause.
+
 **Enable Querying Views**: Whether to allow querying views. Since BigQuery views are not materialized 
 by default, querying them may have a performance overhead.
 

src/main/java/io/cdap/plugin/gcp/bigquery/source/BigQuerySource.java

@@ -241,6 +241,12 @@ private void configureBigQuerySource() {
     if (config.getViewMaterializationDataset() != null) {
       configuration.set(BigQueryConstants.CONFIG_VIEW_MATERIALIZATION_DATASET, config.getViewMaterializationDataset());
     }
+    if (config.getOrderBy() != null) {
+      configuration.set(BigQueryConstants.CONFIG_ORDER_BY, config.getOrderBy());
+    }
+    if (config.getLimit() != null) {
+      configuration.set(BigQueryConstants.CONFIG_LIMIT,  String.valueOf(config.getLimit()));
+    }
   }
 
   public Schema getSchema(FailureCollector collector) {

src/main/java/io/cdap/plugin/gcp/bigquery/source/BigQuerySourceConfig.java

@@ -58,6 +58,7 @@ public final class BigQuerySourceConfig extends BigQueryBaseConfig {
   private static final String VALID_DATE_FORMAT = "yyyy-MM-dd";
   private static final String SCHEME = "gs://";
   private static final String WHERE = "WHERE";
+  private static final String ORDER_BY = "ORDER BY";
   public static final Set<Schema.Type> SUPPORTED_TYPES =
     ImmutableSet.of(Schema.Type.LONG, Schema.Type.STRING, Schema.Type.DOUBLE, Schema.Type.BOOLEAN, Schema.Type.BYTES,
                     Schema.Type.ARRAY, Schema.Type.RECORD);
@@ -70,6 +71,8 @@ public final class BigQuerySourceConfig extends BigQueryBaseConfig {
   public static final String NAME_ENABLE_QUERYING_VIEWS = "enableQueryingViews";
   public static final String NAME_VIEW_MATERIALIZATION_PROJECT = "viewMaterializationProject";
   public static final String NAME_VIEW_MATERIALIZATION_DATASET = "viewMaterializationDataset";
+  public static final String NAME_LIMIT = "limit";
+  public static final String NAME_ORDER_BY = "orderBy";
 
   @Name(Constants.Reference.REFERENCE_NAME)
   @Nullable
@@ -110,6 +113,19 @@ public final class BigQuerySourceConfig extends BigQueryBaseConfig {
     "and discards all rows that do not return TRUE (that is, rows that return FALSE or NULL).")
   private String filter;
 
+  @Name(NAME_ORDER_BY)
+  @Macro
+  @Nullable
+  @Description("The ORDER BY clause sorts the results of a query based on one or more columns. " +
+      "For example, 'name asc, age desc'.")
+  private String orderBy;
+
+  @Name(NAME_LIMIT)
+  @Macro
+  @Nullable
+  @Description("The LIMIT clause restricts the number of rows returned by the query.")
+  private Long limit;
+
   @Name(NAME_ENABLE_QUERYING_VIEWS)
   @Macro
   @Nullable
@@ -176,6 +192,13 @@ public void validate(FailureCollector collector, Map<String, String> arguments)
     if (!containsMacro(NAME_CMEK_KEY)) {
       validateCmekKey(collector, arguments);
     }
+
+    if (!containsMacro(NAME_LIMIT) && limit != null) {
+      if (limit < 0) {
+        collector.addFailure("Invalid limit value.", "Limit must be a non-negative number.")
+            .withConfigProperty(NAME_LIMIT);
+      }
+    }
   }
 
   void validateCmekKey(FailureCollector collector, Map<String, String> arguments) {
@@ -271,17 +294,44 @@ public String getPartitionTo() {
 
   @Nullable
   public String getFilter() {
-    if (filter != null) {
-      filter = filter.trim();
-      if (filter.isEmpty()) {
-        return null;
-      }
-      // remove the WHERE keyword from the filter if the user adds it at the begging of the expression
-      if (filter.toUpperCase().startsWith(WHERE)) {
-        filter = filter.substring(WHERE.length());
-      }
+    return cleanupSqlFragment(filter, WHERE);
+  }
+
+  @Nullable
+  public String getOrderBy() {
+    return cleanupSqlFragment(orderBy, ORDER_BY);
+  }
+
+  @Nullable
+  public Long getLimit() {
+    return limit;
+  }
+
+  /**
+   * Cleans up a SQL fragment by trimming whitespace and stripping a given keyword from the
+   * beginning of the string in a case-insensitive way.
+   *
+   * @param fragment The input SQL string fragment.
+   * @param keyword The SQL keyword to remove (e.g., "WHERE ", "ORDER BY ").
+   * @return The cleaned fragment, or null if the input was null or empty.
+   */
+  @Nullable
+  private String cleanupSqlFragment(@Nullable String fragment, String keyword) {
+    if (Strings.isNullOrEmpty(fragment)) {
+      return null;
+    }
+
+    fragment = fragment.trim();
+
+    if (fragment.isEmpty()) {
+      return null;
     }
-    return filter;
+
+    if (fragment.toUpperCase().startsWith(keyword)) {
+      fragment = fragment.substring(keyword.length()).trim();
+    }
+
+    return fragment.isEmpty() ? null : fragment;
   }
 
   public boolean isEnableQueryingViews() {

src/main/java/io/cdap/plugin/gcp/bigquery/source/PartitionedBigQueryInputFormat.java

@@ -22,6 +22,7 @@
 import com.google.api.services.bigquery.model.JobReference;
 import com.google.api.services.bigquery.model.Table;
 import com.google.api.services.bigquery.model.TableReference;
+import com.google.cloud.bigquery.RangePartitioning;
 import com.google.cloud.bigquery.StandardTableDefinition;
 import com.google.cloud.bigquery.TableDefinition.Type;
 import com.google.cloud.bigquery.TimePartitioning;
@@ -49,6 +50,8 @@
 import org.apache.hadoop.mapreduce.RecordReader;
 import org.apache.hadoop.mapreduce.lib.input.FileSplit;
 import org.apache.hadoop.util.Progressable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;
@@ -65,6 +68,7 @@
  */
 public class PartitionedBigQueryInputFormat extends AbstractBigQueryInputFormat<LongWritable, GenericData.Record> {
 
+  private static final Logger LOG = LoggerFactory.getLogger(PartitionedBigQueryInputFormat.class);
   private InputFormat<LongWritable, GenericData.Record> delegateInputFormat =
     new AvroBigQueryInputFormatWithScopes();
 
@@ -128,17 +132,24 @@ private void processQuery(JobContext context) throws IOException, InterruptedExc
     String partitionFromDate = configuration.get(BigQueryConstants.CONFIG_PARTITION_FROM_DATE, null);
     String partitionToDate = configuration.get(BigQueryConstants.CONFIG_PARTITION_TO_DATE, null);
     String filter = configuration.get(BigQueryConstants.CONFIG_FILTER, null);
+    String limit = configuration.get(BigQueryConstants.CONFIG_LIMIT, null);
+    String orderBy = configuration.get(BigQueryConstants.CONFIG_ORDER_BY, null);
 
     com.google.cloud.bigquery.Table bigQueryTable = BigQueryUtil.getBigQueryTable(
-      datasetProjectId, datasetId, tableName, serviceAccount, isServiceAccountFilePath);
+        datasetProjectId, datasetId, tableName, serviceAccount, isServiceAccountFilePath, null);
     Type type = Objects.requireNonNull(bigQueryTable).getDefinition().getType();
+    Boolean isPartitionFilterRequired = bigQueryTable.getRequirePartitionFilter();
+    StandardTableDefinition tableDefinition = Objects.requireNonNull(bigQueryTable).getDefinition();
 
     String query;
     if (type == Type.VIEW || type == Type.MATERIALIZED_VIEW || type == Type.EXTERNAL) {
-      query = generateQueryForMaterializingView(datasetProjectId, datasetId, tableName, filter);
+      query = generateQueryForMaterializingView(datasetProjectId, datasetId, tableName, filter,
+          limit, orderBy);
     } else {
-      query = generateQuery(partitionFromDate, partitionToDate, filter, projectId, datasetProjectId, datasetId,
-                            tableName, serviceAccount, isServiceAccountFilePath);
+      query = generateQuery(partitionFromDate, partitionToDate, filter, datasetProjectId,
+          datasetId,
+          tableName, limit, orderBy,
+          isPartitionFilterRequired, tableDefinition);
     }
 
     if (query != null) {
@@ -160,30 +171,41 @@ private void processQuery(JobContext context) throws IOException, InterruptedExc
   }
 
   @VisibleForTesting
-  String generateQuery(String partitionFromDate, String partitionToDate, String filter, String project,
-                       String datasetProject, String dataset, String table, @Nullable String serviceAccount,
-                       @Nullable Boolean isServiceAccountFilePath) {
-    if (partitionFromDate == null && partitionToDate == null && filter == null) {
+  String generateQuery(String partitionFromDate, String partitionToDate, String filter,
+      String datasetProject, String dataset, String table, String limit, String orderBy,
+      Boolean isPartitionFilterRequired, StandardTableDefinition tableDefinition) {
+
+    if (Strings.isNullOrEmpty(filter) && Strings.isNullOrEmpty(orderBy) && Strings.isNullOrEmpty(
+        limit)
+        && Strings.isNullOrEmpty(partitionFromDate) && Strings.isNullOrEmpty(partitionToDate)) {
       return null;
     }
-    String queryTemplate = "select * from `%s` where %s";
-    com.google.cloud.bigquery.Table sourceTable = BigQueryUtil.getBigQueryTable(datasetProject, dataset, table,
-                                                                                serviceAccount,
-                                                                                isServiceAccountFilePath);
-    StandardTableDefinition tableDefinition = Objects.requireNonNull(sourceTable).getDefinition();
+
+    RangePartitioning rangePartitioning = tableDefinition.getRangePartitioning();
     TimePartitioning timePartitioning = tableDefinition.getTimePartitioning();
-    if (timePartitioning == null && filter == null) {
-      return null;
-    }
     StringBuilder condition = new StringBuilder();
+    String partitionCondition = null;
 
     if (timePartitioning != null) {
-      String timePartitionCondition = BigQueryUtil.generateTimePartitionCondition(tableDefinition, partitionFromDate,
-                                                                                  partitionToDate);
-      condition.append(timePartitionCondition);
+      if (partitionFromDate == null && partitionToDate == null
+          && Objects.equals(isPartitionFilterRequired, Boolean.TRUE)) {
+        partitionCondition = BigQueryUtil.generateDefaultTimePartitionCondition(tableDefinition);
+      } else if (partitionFromDate != null || partitionToDate != null) {
+        partitionCondition =
+            BigQueryUtil.generateTimePartitionCondition(tableDefinition, partitionFromDate,
+                partitionToDate);
+      }
+    } else if (rangePartitioning != null && Objects.equals(isPartitionFilterRequired,
+        Boolean.TRUE)) {
+      partitionCondition = BigQueryUtil.generateDefaultRangePartitionCondition(
+          tableDefinition);
     }
 
-    if (filter != null) {
+    if (!Strings.isNullOrEmpty(partitionCondition)) {
+      condition.append("(").append(partitionCondition).append(")");
+    }
+
+    if (!Strings.isNullOrEmpty(filter)) {
       if (condition.length() == 0) {
         condition.append(filter);
       } else {
@@ -192,20 +214,42 @@ String generateQuery(String partitionFromDate, String partitionToDate, String fi
     }
 
     String tableName = datasetProject + "." + dataset + "." + table;
-    return String.format(queryTemplate, tableName, condition.toString());
+    StringBuilder query = new StringBuilder("select * from ").append(tableName);
+
+    if (condition.length() > 0) {
+      query.append(" where ").append(condition);
+    }
+
+    if (!Strings.isNullOrEmpty(orderBy)) {
+      query.append(" order by ").append(orderBy);
+    }
+
+    if (!Strings.isNullOrEmpty(limit)) {
+      query.append(" limit ").append(limit);
+    }
+
+    LOG.debug("Generated BigQuery query for job: {}", query);
+    return query.toString();
   }
 
   @VisibleForTesting
-  String generateQueryForMaterializingView(String datasetProject, String dataset, String table, String filter) {
-    String queryTemplate = "select * from `%s`%s";
-    StringBuilder condition = new StringBuilder();
-
+  String generateQueryForMaterializingView(String datasetProject, String dataset, String table,
+      String filter, String limit, String orderBy) {
+    String tableName = String.format("`%s.%s.%s`", datasetProject, dataset, table);
+    StringBuilder query = new StringBuilder("select * from ").append(tableName);
     if (!Strings.isNullOrEmpty(filter)) {
-      condition.append(String.format(" where %s", filter));
+      query.append(" where ").append(filter);
     }
 
-    String tableName = datasetProject + "." + dataset + "." + table;
-    return String.format(queryTemplate, tableName, condition.toString());
+    if (!Strings.isNullOrEmpty(orderBy)) {
+      query.append(" order by ").append(orderBy);
+    }
+
+    if (!Strings.isNullOrEmpty(limit)) {
+      query.append(" limit ").append(limit);
+    }
+
+    return query.toString();
   }
 
   /**

src/main/java/io/cdap/plugin/gcp/bigquery/util/BigQueryConstants.java

@@ -36,6 +36,8 @@ public interface BigQueryConstants {
   String CONFIG_TABLE_FIELDS = "cdap.bq.sink.table.fields";
   String CONFIG_JSON_STRING_FIELDS = "cdap.bq.sink.json.string.fields";
   String CONFIG_FILTER = "cdap.bq.source.filter";
+  String CONFIG_LIMIT = "cdap.bq.source.limit";
+  String CONFIG_ORDER_BY = "cdap.bq.source.order.by";
   String CONFIG_PARTITION_FILTER = "cdap.bq.sink.partition.filter";
   String CONFIG_JOB_ID = "cdap.bq.sink.job.id";
   String CONFIG_VIEW_MATERIALIZATION_PROJECT = "cdap.bq.source.view.materialization.project";

src/main/java/io/cdap/plugin/gcp/bigquery/util/BigQueryUtil.java

@@ -24,6 +24,7 @@
 import com.google.cloud.bigquery.Field;
 import com.google.cloud.bigquery.FieldList;
 import com.google.cloud.bigquery.LegacySQLTypeName;
+import com.google.cloud.bigquery.RangePartitioning;
 import com.google.cloud.bigquery.StandardSQLTypeName;
 import com.google.cloud.bigquery.StandardTableDefinition;
 import com.google.cloud.bigquery.Table;
@@ -83,7 +84,7 @@ public final class BigQueryUtil {
 
   private static final Logger LOG = LoggerFactory.getLogger(BigQueryUtil.class);
 
-  private static final String DEFAULT_PARTITION_COLUMN_NAME = "_PARTITIONTIME";
+  public static final String DEFAULT_PARTITION_COLUMN_NAME = "_PARTITIONTIME";
   private static final String BIGQUERY_BUCKET_PREFIX_PROPERTY_NAME = "gcp.bigquery.bucket.prefix";
 
   public static final String BUCKET_PATTERN = "[a-z0-9._-]+";
@@ -824,6 +825,43 @@ public static String generateTimePartitionCondition(StandardTableDefinition tabl
     return timePartitionCondition.toString();
   }
 
+  /**
+   * Generates a default "IS NOT NULL OR IS NULL" partition condition for a time-partitioned table.
+   *
+   * @param tableDefinition The definition of the table.
+   * @return The SQL condition string or an empty string if no condition is needed.
+   */
+  public static String generateDefaultTimePartitionCondition(
+      StandardTableDefinition tableDefinition) {
+    TimePartitioning timePartitioning = tableDefinition.getTimePartitioning();
+    if (timePartitioning == null) {
+      return StringUtils.EMPTY;
+    }
+
+    String columnName = timePartitioning.getField() != null ?
+        timePartitioning.getField() : DEFAULT_PARTITION_COLUMN_NAME;
+
+    return String.format("`%s` IS NOT NULL OR `%s` IS NULL", columnName, columnName);
+  }
+
+  /**
+   * Generates a default "IS NOT NULL OR IS NULL" partition condition for a range-partitioned
+   * table.
+   *
+   * @param tableDefinition The definition of the table.
+   * @return The SQL condition string or an empty string if no condition is needed.
+   */
+  public static String generateDefaultRangePartitionCondition(
+      StandardTableDefinition tableDefinition) {
+    RangePartitioning rangePartitioning = tableDefinition.getRangePartitioning();
+    if (rangePartitioning == null || Strings.isNullOrEmpty(rangePartitioning.getField())) {
+      return StringUtils.EMPTY;
+    }
+
+    String columnName = rangePartitioning.getField();
+    return String.format("`%s` IS NOT NULL OR `%s` IS NULL", columnName, columnName);
+  }
+
   /**
    * Get fully-qualified name (FQN) for a BQ table (FQN format:
    * bigquery:{projectId}.{datasetId}.{tableId}).