[fix](paimon) get the correct schema when querying paimon table

docker/thirdparties/docker-compose/iceberg/scripts/create_preinstalled_scripts/paimon/run01.sql

@@ -76,4 +76,12 @@ CREATE TABLE date_partition (
     'file.format'='orc'
 );
 
-insert into date_partition values(1,date '2020-01-01');
+insert into date_partition values(1,date '2020-01-01');
+
+drop table if exists test_schema_change;
+create table test_schema_change;
+alter table test_schema_change add column id int;
+insert into test_schema_change values(1);
+CALL sys.create_tag(table => 'test_schema_change', tag => 'tag1', snapshot => 1);
+CALL sys.create_branch('test_schema_change', 'branch1', 'tag1');
+alter table test_schema_change add column name string;

fe/fe-core/src/main/java/org/apache/doris/common/util/TimeUtils.java

@@ -292,6 +292,18 @@ public static long timeStringToLong(String timeStr, TimeZone timeZone) {
         return d.atZone(timeZone.toZoneId()).toInstant().toEpochMilli();
     }
 
+    public static long msTimeStringToLong(String timeStr, TimeZone timeZone) {
+        DateTimeFormatter dateFormatTimeZone = getDatetimeMsFormatWithTimeZone();
+        dateFormatTimeZone.withZone(timeZone.toZoneId());
+        LocalDateTime d;
+        try {
+            d = LocalDateTime.parse(timeStr, dateFormatTimeZone);
+        } catch (DateTimeParseException e) {
+            return -1;
+        }
+        return d.atZone(timeZone.toZoneId()).toInstant().toEpochMilli();
+    }
+
     // Check if the time zone_value is valid
     public static String checkTimeZoneValidAndStandardize(String value) throws DdlException {
         Function<String, String> standardizeValue = s -> {

fe/fe-core/src/main/java/org/apache/doris/datasource/paimon/PaimonExternalTable.java

@@ -54,6 +54,7 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.apache.paimon.CoreOptions;
+import org.apache.paimon.Snapshot;
 import org.apache.paimon.partition.Partition;
 import org.apache.paimon.schema.TableSchema;
 import org.apache.paimon.table.DataTable;
@@ -98,10 +99,28 @@ public Table getPaimonTable(Optional<MvccSnapshot> snapshot) {
         return getOrFetchSnapshotCacheValue(snapshot).getSnapshot().getTable();
     }
 
-    private PaimonSnapshotCacheValue getPaimonSnapshotCacheValue() {
+    private PaimonSnapshotCacheValue getPaimonSnapshotCacheValue(Optional<TableSnapshot> tableSnapshot,
+            Optional<TableScanParams> scanParams) {
         makeSureInitialized();
-        return Env.getCurrentEnv().getExtMetaCacheMgr().getPaimonMetadataCache()
-                .getPaimonSnapshot(this);
+        if (tableSnapshot.isPresent() || (scanParams.isPresent() && scanParams.get().isTag())) {
+            // If a snapshot is specified,
+            // use the specified snapshot and the corresponding schema(not the latest
+            // schema).
+            try {
+                Snapshot snapshot = PaimonUtil.getPaimonSnapshot(paimonTable, tableSnapshot, scanParams);
+                return new PaimonSnapshotCacheValue(PaimonPartitionInfo.EMPTY,
+                        new PaimonSnapshot(snapshot.id(), snapshot.schemaId(), paimonTable));
+            } catch (Exception e) {
+                LOG.warn("Failed to get Paimon snapshot for table {}", paimonTable.name(), e);
+                throw new RuntimeException(
+                        "Failed to get Paimon snapshot: " + (e.getMessage() == null ? "unknown cause" : e.getMessage()),
+                        e);
+            }
+        } else {
+            // Otherwise, use the latest snapshot and the latest schema.
+            return Env.getCurrentEnv().getExtMetaCacheMgr().getPaimonMetadataCache()
+                    .getPaimonSnapshot(this);
+        }
     }
 
     @Override
@@ -212,7 +231,8 @@ public MTMVSnapshotIf getTableSnapshot(Optional<MvccSnapshot> snapshot) throws A
 
     @Override
     public long getNewestUpdateVersionOrTime() {
-        return getPaimonSnapshotCacheValue().getPartitionInfo().getNameToPartition().values().stream()
+        return getPaimonSnapshotCacheValue(Optional.empty(), Optional.empty()).getPartitionInfo().getNameToPartition()
+                .values().stream()
                 .mapToLong(Partition::lastFileCreationTime).max().orElse(0);
     }
 
@@ -228,7 +248,7 @@ public boolean isPartitionColumnAllowNull() {
 
     @Override
     public MvccSnapshot loadSnapshot(Optional<TableSnapshot> tableSnapshot, Optional<TableScanParams> scanParams) {
-        return new PaimonMvccSnapshot(getPaimonSnapshotCacheValue());
+        return new PaimonMvccSnapshot(getPaimonSnapshotCacheValue(tableSnapshot, scanParams));
     }
 
     @Override
@@ -289,7 +309,7 @@ private PaimonSnapshotCacheValue getOrFetchSnapshotCacheValue(Optional<MvccSnaps
         if (snapshot.isPresent()) {
             return ((PaimonMvccSnapshot) snapshot.get()).getSnapshotCacheValue();
         } else {
-            return getPaimonSnapshotCacheValue();
+            return getPaimonSnapshotCacheValue(Optional.empty(), Optional.empty());
         }
     }
 

fe/fe-core/src/main/java/org/apache/doris/datasource/paimon/PaimonMetadataCache.java

@@ -36,6 +36,8 @@
 import org.apache.paimon.CoreOptions;
 import org.apache.paimon.Snapshot;
 import org.apache.paimon.partition.Partition;
+import org.apache.paimon.schema.TableSchema;
+import org.apache.paimon.table.DataTable;
 import org.apache.paimon.table.Table;
 import org.jetbrains.annotations.NotNull;
 
@@ -115,14 +117,14 @@ private PaimonSnapshot loadLatestSnapshot(PaimonSnapshotCacheKey key) throws IOE
         Table snapshotTable = table;
         // snapshotId and schemaId
         Long latestSnapshotId = PaimonSnapshot.INVALID_SNAPSHOT_ID;
-        long latestSchemaId = 0L;
         Optional<Snapshot> optionalSnapshot = table.latestSnapshot();
         if (optionalSnapshot.isPresent()) {
             latestSnapshotId = optionalSnapshot.get().id();
-            latestSchemaId = table.snapshot(latestSnapshotId).schemaId();
             snapshotTable =
                 table.copy(Collections.singletonMap(CoreOptions.SCAN_SNAPSHOT_ID.key(), latestSnapshotId.toString()));
         }
+        DataTable dataTable = (DataTable) table;
+        long latestSchemaId = dataTable.schemaManager().latest().map(TableSchema::id).orElse(0L);
         return new PaimonSnapshot(latestSnapshotId, latestSchemaId, snapshotTable);
     }
 

fe/fe-core/src/main/java/org/apache/doris/datasource/paimon/PaimonUtil.java

@@ -28,6 +28,7 @@
 import org.apache.doris.catalog.Type;
 import org.apache.doris.common.AnalysisException;
 import org.apache.doris.common.UserException;
+import org.apache.doris.common.util.TimeUtils;
 import org.apache.doris.datasource.ExternalTable;
 import org.apache.doris.datasource.hive.HiveUtil;
 import org.apache.doris.datasource.paimon.source.PaimonSource;
@@ -49,6 +50,7 @@
 import org.apache.logging.log4j.Logger;
 import org.apache.paimon.CoreOptions;
 import org.apache.paimon.CoreOptions.StartupMode;
+import org.apache.paimon.Snapshot;
 import org.apache.paimon.data.BinaryRow;
 import org.apache.paimon.data.InternalRow;
 import org.apache.paimon.data.Timestamp;
@@ -58,9 +60,11 @@
 import org.apache.paimon.predicate.Predicate;
 import org.apache.paimon.reader.RecordReader;
 import org.apache.paimon.schema.TableSchema;
+import org.apache.paimon.table.DataTable;
 import org.apache.paimon.table.FileStoreTable;
 import org.apache.paimon.table.Table;
 import org.apache.paimon.table.source.ReadBuilder;
+import org.apache.paimon.tag.Tag;
 import org.apache.paimon.types.ArrayType;
 import org.apache.paimon.types.CharType;
 import org.apache.paimon.types.DataField;
@@ -75,8 +79,10 @@
 import org.apache.paimon.utils.Projection;
 import org.apache.paimon.utils.RowDataToObjectArrayConverter;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.time.DateTimeException;
 import java.time.LocalDate;
 import java.time.LocalTime;
 import java.time.ZoneId;
@@ -87,6 +93,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 import javax.annotation.Nullable;
@@ -656,6 +663,75 @@ public static Table getTableByTag(Table baseTable, String tagName) throws UserEx
         return baseTable.copy(options);
     }
 
+    // get snapshot info from query like 'for version/time as of' or '@tag'
+    public static Snapshot getPaimonSnapshot(Table table, Optional<TableSnapshot> querySnapshot,
+            Optional<TableScanParams> scanParams) throws UserException {
+        Preconditions.checkArgument(querySnapshot.isPresent() || (scanParams.isPresent() && scanParams.get().isTag()),
+                "should spec version or time or tag");
+        Preconditions.checkArgument(!(querySnapshot.isPresent() && scanParams.isPresent()),
+                "should not spec both snapshot and scan params");
+
+        DataTable dataTable = (DataTable) table;
+        if (querySnapshot.isPresent()) {
+            return getPaimonSnapshotByTableSnapshot(dataTable, querySnapshot.get());
+        } else if (scanParams.isPresent() && scanParams.get().isTag()) {
+            return getPaimonSnapshotByTag(dataTable, extractBranchOrTagName(scanParams.get()));
+        } else {
+            throw new UserException("should spec version or time or tag");
+        }
+    }
+
+    private static Snapshot getPaimonSnapshotByTableSnapshot(DataTable table, TableSnapshot tableSnapshot)
+            throws UserException {
+        final String value = tableSnapshot.getValue();
+        final TableSnapshot.VersionType type = tableSnapshot.getType();
+        final boolean isDigital = DIGITAL_REGEX.matcher(value).matches();
+
+        switch (type) {
+            case TIME:
+                return getPaimonSnapshotByTimestamp(table, value, isDigital);
+            case VERSION:
+                return isDigital ? getPaimonSnapshotBySnapshotId(table, value) : getPaimonSnapshotByTag(table, value);
+            default:
+                throw new UserException("Unsupported snapshot type: " + type);
+        }
+    }
+
+    private static Snapshot getPaimonSnapshotByTimestamp(DataTable table, String timestamp, boolean isDigital)
+            throws UserException {
+        long timestampMillis = 0;
+        if (isDigital) {
+            timestampMillis = Long.parseLong(timestamp);
+        } else {
+            timestampMillis = TimeUtils.msTimeStringToLong(timestamp, TimeUtils.getTimeZone());
+            if (timestampMillis < 0) {
+                throw new DateTimeException("can't parse time: " + timestamp);
+            }
+        }
+        Snapshot snapshot = table.snapshotManager().earlierOrEqualTimeMills(timestampMillis);
+        if (snapshot == null) {
+            throw new UserException("can't find snapshot older than : " + timestamp);
+        }
+        return snapshot;
+    }
+
+    private static Snapshot getPaimonSnapshotBySnapshotId(DataTable table, String snapshotString)
+            throws UserException {
+        long snapshotId = Long.parseLong(snapshotString);
+        try {
+            Snapshot snapshot = table.snapshotManager().tryGetSnapshot(snapshotId);
+            return snapshot;
+        } catch (FileNotFoundException e) {
+            throw new UserException("can't find snapshot by id: " + snapshotId, e);
+        }
+    }
+
+    private static Snapshot getPaimonSnapshotByTag(DataTable table, String tagName)
+            throws UserException {
+        Optional<Tag> tag = table.tagManager().get(tagName);
+        return tag.orElseThrow(() -> new UserException("can't find snapshot by tag: " + tagName));
+    }
+
     /**
      * Creates a map of conflicting Paimon options with null values for exclusion.
      *

fe/fe-core/src/main/java/org/apache/doris/datasource/paimon/source/PaimonScanNode.java

@@ -49,7 +49,6 @@
 import com.google.common.annotations.VisibleForTesting;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.apache.paimon.CoreOptions;
 import org.apache.paimon.data.BinaryRow;
 import org.apache.paimon.predicate.Predicate;
 import org.apache.paimon.schema.TableSchema;
@@ -384,20 +383,16 @@ public Map<String, String> getIncrReadParams() throws UserException {
 
     @VisibleForTesting
     public List<org.apache.paimon.table.source.Split> getPaimonSplitFromAPI() throws UserException {
-        if (!source.getPaimonTable().options().containsKey(CoreOptions.SCAN_SNAPSHOT_ID.key())) {
-            // an empty table in PaimonSnapshotCacheValue
-            return Collections.emptyList();
-        }
+        Table paimonTable = getProcessedTable();
         int[] projected = desc.getSlots().stream().mapToInt(
-                        slot -> source.getPaimonTable().rowType()
-                                .getFieldNames()
-                                .stream()
-                                .map(String::toLowerCase)
-                                .collect(Collectors.toList())
-                                .indexOf(slot.getColumn().getName()))
+                slot -> paimonTable.rowType()
+                        .getFieldNames()
+                        .stream()
+                        .map(String::toLowerCase)
+                        .collect(Collectors.toList())
+                        .indexOf(slot.getColumn().getName()))
+                .filter(i -> i >= 0)
                 .toArray();
-
-        Table paimonTable = getProcessedTable();
         ReadBuilder readBuilder = paimonTable.newReadBuilder();
         return readBuilder.withFilter(predicates)
                 .withProjection(projected)
@@ -713,5 +708,3 @@ private Table getProcessedTable() throws UserException {
         return baseTable;
     }
 }
-
-

fe/fe-core/src/main/java/org/apache/doris/job/extensions/mtmv/MTMVTask.java

@@ -468,7 +468,7 @@ private void beforeMTMVRefresh() throws AnalysisException, DdlException {
             }
             if (tableIf instanceof MvccTable) {
                 MvccTable mvccTable = (MvccTable) tableIf;
-                MvccSnapshot mvccSnapshot = mvccTable.loadSnapshot(Optional.empty(), null);
+                MvccSnapshot mvccSnapshot = mvccTable.loadSnapshot(Optional.empty(), Optional.empty());
                 snapshots.put(new MvccTableInfo(mvccTable), mvccSnapshot);
             }
         }

regression-test/data/external_table_p0/iceberg/test_iceberg_schema_change_with_branch_tag.out

@@ -0,0 +1,30 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !desc_schema --
+id	int	Yes	true	\N	
+name	text	Yes	true	\N	
+
+-- !select_table --
+1	\N
+2	\N
+3	\N
+
+-- !select_branch --
+1	\N
+2	\N
+3	\N
+
+-- !select_branch2 --
+1	\N
+2	\N
+3	\N
+
+-- !select_tag --
+1
+2
+3
+
+-- !select_tag2 --
+1
+2
+3
+

regression-test/data/external_table_p0/paimon/test_paimon_schema_change.out

@@ -230,3 +230,22 @@ new_col1	array<int>	Yes	true	\N
 -- !count_4 --
 3
 
+-- !desc_latest_schema --
+id	int	Yes	true	\N	
+name	varchar(2147483647)	Yes	true	\N	
+
+-- !query_latest_schema --
+1	\N
+
+-- !time_travel_schema_branch --
+1	\N
+
+-- !time_travel_schema_tag --
+1
+
+-- !time_travel_schema_tag2 --
+1
+
+-- !time_travel_schema_snapshot --
+1
+