public GenericUDAFEvaluator getGenericUDAFEvaluator() {
if (genericUDAFEvaluator != null) {
return genericUDAFEvaluator;
}
if (genericUDAFWritableEvaluator != null) {
return genericUDAFEvaluator = genericUDAFWritableEvaluator;
}
try {
return genericUDAFEvaluator =
ReflectionUtils.newInstance(
Class.forName(
genericUDAFEvaluatorClassName,
true,
Utilities.getSessionSpecifiedClassLoader())
.asSubclass(GenericUDAFEvaluator.class),
null);
} catch (ClassNotFoundException e) {
throw new RuntimeException(e);
}
}
/**
* Pre-analyze hook called after compilation and before semantic analysis We extract things for to
* Database and metadata level operations which are not capture in the input/output entities
* during semantic analysis. Ideally it should be handled in Hive. We need to move most of these
* into hive semantic analyzer and then remove it from the access hook.
*/
@Override
public ASTNode preAnalyze(HiveSemanticAnalyzerHookContext context, ASTNode ast)
throws SemanticException {
switch (ast.getToken().getType()) {
// Hive parser doesn't capture the database name in output entity, so we store it here for
// now
case HiveParser.TOK_CREATEDATABASE:
case HiveParser.TOK_ALTERDATABASE_PROPERTIES:
case HiveParser.TOK_DROPDATABASE:
case HiveParser.TOK_SWITCHDATABASE:
case HiveParser.TOK_DESCDATABASE:
currDB = new Database(BaseSemanticAnalyzer.unescapeIdentifier(ast.getChild(0).getText()));
break;
case HiveParser.TOK_CREATETABLE:
case HiveParser.TOK_CREATEVIEW:
/*
* Compiler doesn't create read/write entities for create table.
* Hence we need extract dbname from db.tab format, if applicable
*/
currDB = extractDatabase((ASTNode) ast.getChild(0));
break;
case HiveParser.TOK_DROPTABLE:
case HiveParser.TOK_DROPVIEW:
case HiveParser.TOK_SHOW_CREATETABLE:
case HiveParser.TOK_ALTERTABLE_SERIALIZER:
case HiveParser.TOK_ALTERVIEW_ADDPARTS:
case HiveParser.TOK_ALTERVIEW_DROPPARTS:
case HiveParser.TOK_ALTERVIEW_PROPERTIES:
case HiveParser.TOK_ALTERVIEW_RENAME:
case HiveParser.TOK_CREATEINDEX:
case HiveParser.TOK_DROPINDEX:
case HiveParser.TOK_LOCKTABLE:
case HiveParser.TOK_UNLOCKTABLE:
currTab = extractTable((ASTNode) ast.getFirstChildWithType(HiveParser.TOK_TABNAME));
currDB = extractDatabase((ASTNode) ast.getChild(0));
break;
case HiveParser.TOK_ALTERINDEX_REBUILD:
currTab = extractTable((ASTNode) ast.getChild(0)); // type is not TOK_TABNAME
currDB = extractDatabase((ASTNode) ast.getChild(0));
break;
case HiveParser.TOK_SHOW_TABLESTATUS:
currDB = extractDatabase((ASTNode) ast.getChild(0));
int children = ast.getChildCount();
for (int i = 1; i < children; i++) {
ASTNode child = (ASTNode) ast.getChild(i);
if (child.getToken().getType() == HiveParser.Identifier) {
currDB = new Database(child.getText());
break;
}
}
// loosing the requested privileges for possible wildcard tables, since
// further authorization will be done at the filter step and those unwanted will
// eventually be filtered out from the output
currTab = Table.ALL;
break;
case HiveParser.TOK_ALTERTABLE_RENAME:
case HiveParser.TOK_ALTERTABLE_PROPERTIES:
case HiveParser.TOK_ALTERTABLE_DROPPARTS:
case HiveParser.TOK_ALTERTABLE_RENAMECOL:
case HiveParser.TOK_ALTERTABLE_ADDCOLS:
case HiveParser.TOK_ALTERTABLE_REPLACECOLS:
case HiveParser.TOK_SHOW_TBLPROPERTIES:
case HiveParser.TOK_SHOWINDEXES:
case HiveParser.TOK_SHOWPARTITIONS:
// token name TOK_TABNAME is not properly set in this case
currTab = extractTable((ASTNode) ast.getChild(0));
currDB = extractDatabase((ASTNode) ast.getChild(0));
break;
case HiveParser.TOK_MSCK:
// token name TOK_TABNAME is not properly set in this case and child(0) does
// not contain the table name.
// TODO: Fix Hive to capture the table and DB name
currOutTab = extractTable((ASTNode) ast.getChild(1));
currOutDB = extractDatabase((ASTNode) ast.getChild(0));
break;
case HiveParser.TOK_ALTERTABLE_ADDPARTS:
/*
* Compiler doesn't create read/write entities for create table.
* Hence we need extract dbname from db.tab format, if applicable
*/
currTab = extractTable((ASTNode) ast.getChild(0));
currDB = extractDatabase((ASTNode) ast.getChild(0));
partitionURI = extractPartition(ast);
break;
case HiveParser.TOK_CREATEFUNCTION:
String udfClassName = BaseSemanticAnalyzer.unescapeSQLString(ast.getChild(1).getText());
try {
CodeSource udfSrc =
Class.forName(udfClassName, true, Utilities.getSessionSpecifiedClassLoader())
.getProtectionDomain()
.getCodeSource();
if (udfSrc == null) {
throw new SemanticException("Could not resolve the jar for UDF class " + udfClassName);
}
String udfJar = udfSrc.getLocation().getPath();
if (udfJar == null || udfJar.isEmpty()) {
throw new SemanticException(
"Could not find the jar for UDF class " + udfClassName + "to validate privileges");
}
udfURI = parseURI(udfSrc.getLocation().toString(), true);
} catch (ClassNotFoundException e) {
throw new SemanticException("Error retrieving udf class:" + e.getMessage(), e);
}
// create/drop function is allowed with any database
currDB = Database.ALL;
break;
case HiveParser.TOK_DROPFUNCTION:
// create/drop function is allowed with any database
currDB = Database.ALL;
break;
case HiveParser.TOK_LOAD:
String dbName =
BaseSemanticAnalyzer.unescapeIdentifier(
ast.getChild(1).getChild(0).getChild(0).getText());
currDB = new Database(dbName);
break;
case HiveParser.TOK_DESCTABLE:
currDB = getCanonicalDb();
// For DESCRIBE FORMATTED/EXTENDED ast will have an additional child node with value
// "FORMATTED/EXTENDED".
isDescTableBasic = (ast.getChildCount() == 1);
break;
case HiveParser.TOK_TRUNCATETABLE:
// SENTRY-826:
// Truncate empty partitioned table should throw SemanticException only if the
// user does not have permission.
// In postAnalyze, currOutDB and currOutTbl will be added into outputHierarchy
// which will be validated in the hiveAuthzBinding.authorize method.
Preconditions.checkArgument(ast.getChildCount() == 1);
// childcount is 1 for table without partition, 2 for table with partitions
Preconditions.checkArgument(ast.getChild(0).getChildCount() >= 1);
Preconditions.checkArgument(ast.getChild(0).getChild(0).getChildCount() == 1);
currOutDB = extractDatabase((ASTNode) ast.getChild(0));
currOutTab = extractTable((ASTNode) ast.getChild(0).getChild(0).getChild(0));
break;
default:
currDB = getCanonicalDb();
break;
}
return ast;
}
