return command;
} else if (readIf("RENAME")) {
read("TO");
String newName = readIdentifierWithSchema(table.getSchema().getName());
checkSchema(table.getSchema());
AlterTableRename command = new AlterTableRename(session, getSchema());
command.setOldTable(table);
command.setNewTableName(newName);
command.setHidden(readIf("HIDDEN"));
return command;
} else if (readIf("DROP")) {
if (readIf("CONSTRAINT")) {
boolean ifExists = readIfExists(false);
String constraintName = readIdentifierWithSchema(table.getSchema().getName());
ifExists = readIfExists(ifExists);
checkSchema(table.getSchema());
AlterTableDropConstraint command = new AlterTableDropConstraint(session, getSchema(), ifExists);
command.setConstraintName(constraintName);
return command;
} else if (readIf("PRIMARY")) {
read("KEY");
Index idx = table.getPrimaryKey();
DropIndex command = new DropIndex(session, table.getSchema());
command.setIndexName(idx.getName());
return command;
} else {
readIf("COLUMN");
boolean ifExists = readIfExists(false);
AlterTableAlterColumn command = new AlterTableAlterColumn(session, table.getSchema());
command.setType(CommandInterface.ALTER_TABLE_DROP_COLUMN);
String columnName = readColumnIdentifier();
command.setTable(table);
if (ifExists && !table.doesColumnExist(columnName)) {
return new NoOperation(session);
}
command.setOldColumn(table.getColumn(columnName));
return command;
}
} else if (readIf("MODIFY")) {
// MySQL compatibility
readIf("COLUMN");
String columnName = readColumnIdentifier();
Column column = table.getColumn(columnName);
return parseAlterTableAlterColumnType(table, columnName, column);
} else if (readIf("ALTER")) {
readIf("COLUMN");
String columnName = readColumnIdentifier();
Column column = table.getColumn(columnName);
if (readIf("RENAME")) {
read("TO");
AlterTableRenameColumn command = new AlterTableRenameColumn(session);
command.setTable(table);
command.setColumn(column);
String newName = readColumnIdentifier();
command.setNewColumnName(newName);
return command;
} else if (readIf("DROP")) {
// PostgreSQL compatibility
if (readIf("DEFAULT")) {
AlterTableAlterColumn command = new AlterTableAlterColumn(session, table.getSchema());
command.setTable(table);
command.setOldColumn(column);
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT);
command.setDefaultExpression(null);
return command;
}
read("NOT");
read("NULL");
AlterTableAlterColumn command = new AlterTableAlterColumn(session, table.getSchema());
command.setTable(table);
command.setOldColumn(column);
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_NULL);
return command;
} else if (readIf("TYPE")) {
// PostgreSQL compatibility
return parseAlterTableAlterColumnType(table, columnName, column);
} else if (readIf("SET")) {
if (readIf("DATA")) {
// Derby compatibility
read("TYPE");
return parseAlterTableAlterColumnType(table, columnName, column);
}
AlterTableAlterColumn command = new AlterTableAlterColumn(session, table.getSchema());
command.setTable(table);
command.setOldColumn(column);
if (readIf("NULL")) {
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_NULL);
return command;
} else if (readIf("NOT")) {
read("NULL");
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_NOT_NULL);
return command;
} else if (readIf("DEFAULT")) {
Expression defaultExpression = readExpression();
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT);
command.setDefaultExpression(defaultExpression);
return command;
}
} else if (readIf("RESTART")) {
readIf("WITH");
Expression start = readExpression();
AlterSequence command = new AlterSequence(session, table.getSchema());
command.setColumn(column);
command.setStartWith(start);
return command;
} else if (readIf("SELECTIVITY")) {
AlterTableAlterColumn command = new AlterTableAlterColumn(session, table.getSchema());
command.setTable(table);
command.setType(CommandInterface.ALTER_TABLE_ALTER_COLUMN_SELECTIVITY);
command.setOldColumn(column);
command.setSelectivity(readExpression());
return command;
} else {
return parseAlterTableAlterColumnType(table, columnName, column);
}
}