SQL: Support multi-index format as table identifier

Extend tableIdentifier to support multi-index format; not just * but
also enumeration and exclusion

Fix #33162

Author: costin

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/analysis/index/IndexResolver.java

@@ -19,6 +19,7 @@
 import org.elasticsearch.client.Client;
 import org.elasticsearch.cluster.metadata.AliasMetaData;
 import org.elasticsearch.cluster.metadata.MappingMetaData;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.collect.ImmutableOpenMap;
 import org.elasticsearch.index.IndexNotFoundException;
 import org.elasticsearch.xpack.sql.type.EsField;
@@ -300,7 +301,7 @@ public void resolveAsSeparateMappings(String indexWildcard, String javaRegex, Ac
     private static GetIndexRequest createGetIndexRequest(String index) {
         return new GetIndexRequest()
                 .local(true)
-                .indices(index)
+                .indices(Strings.commaDelimitedListToStringArray(index))
                 .features(Feature.MAPPINGS)
                 //lenient because we throw our own errors looking at the response e.g. if something was not resolved
                 //also because this way security doesn't throw authorization exceptions but rather honours ignore_unavailable

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/execution/search/Querier.java

@@ -12,6 +12,7 @@
 import org.elasticsearch.action.search.ShardSearchFailure;
 import org.elasticsearch.client.Client;
 import org.elasticsearch.common.Nullable;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.logging.Loggers;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.common.util.CollectionUtils;
@@ -92,7 +93,7 @@ public void query(Schema schema, QueryContainer query, String index, ActionListe
             log.trace("About to execute query {} on {}", StringUtils.toString(sourceBuilder), index);
         }
 
-        SearchRequest search = prepareRequest(client, sourceBuilder, timeout, index);
+        SearchRequest search = prepareRequest(client, sourceBuilder, timeout, Strings.commaDelimitedListToStringArray(index));
 
         ActionListener<SearchResponse> l;
         if (query.isAggsOnly()) {

x-pack/plugin/sql/src/main/java/org/elasticsearch/xpack/sql/parser/IdentifierBuilder.java

@@ -21,23 +21,9 @@ public TableIdentifier visitTableIdentifier(TableIdentifierContext ctx) {
         ParseTree tree = ctx.name != null ? ctx.name : ctx.TABLE_IDENTIFIER();
         String index = tree.getText();
 
-        validateIndex(index, source);
         return new TableIdentifier(source, visitIdentifier(ctx.catalog), index);
     }
 
-    // see https://github.com/elastic/elasticsearch/issues/6736
-    static void validateIndex(String index, Location source) {
-        for (int i = 0; i < index.length(); i++) {
-            char c = index.charAt(i);
-            if (Character.isUpperCase(c)) {
-                throw new ParsingException(source, "Invalid index name (needs to be lowercase) {}", index);
-            }
-            if (c == '\\' || c == '/' || c == '<' || c == '>' || c == '|' || c == ',' || c == ' ') {
-                throw new ParsingException(source, "Invalid index name (illegal character {}) {}", c, index);
-            }
-        }
-    }
-
     @Override
     public String visitIdentifier(IdentifierContext ctx) {
         return ctx == null ? null : ctx.getText();

x-pack/plugin/sql/src/test/java/org/elasticsearch/xpack/sql/parser/IdentifierBuilderTests.java

@@ -162,3 +162,27 @@ last_name            | VARCHAR
 last_name.keyword    | VARCHAR
 salary               | INTEGER
 ;
+
+
+describeIncludeExclude
+DESCRIBE "test_emp*,-test_alias*";
+
+column:s             |   type:s
+birth_date           | TIMESTAMP
+dep                  | STRUCT
+dep.dep_id           | VARCHAR
+dep.dep_name         | VARCHAR
+dep.dep_name.keyword | VARCHAR
+dep.from_date        | TIMESTAMP
+dep.to_date          | TIMESTAMP
+emp_no               | INTEGER
+first_name           | VARCHAR
+first_name.keyword   | VARCHAR
+gender               | VARCHAR
+hire_date            | TIMESTAMP
+languages            | TINYINT
+last_name            | VARCHAR
+last_name.keyword    | VARCHAR
+salary               | INTEGER
+;
+