Examples with HiveASTParser org.apache.flink.table.planner.delegation.hive.parse.HiveASTParser used on opensource projects

Example 1 with HiveASTParser

use of org.apache.flink.table.planner.delegation.hive.parse.HiveASTParser in project flink by apache.

the class HiveASTParseDriver method parse.

/**
 * Parses a command, optionally assigning the parser's token stream to the given context.
 *
 * @param command command to parse
 * @param ctx context with which to associate this parser's token stream, or null if either no
 *     context is available or the context already has an existing stream
 * @return parsed AST
 */
public HiveParserASTNode parse(String command, HiveParserContext ctx, String viewFullyQualifiedName) throws HiveASTParseException {
    if (LOG.isDebugEnabled()) {
        LOG.debug("Parsing command: " + command);
    }
    HiveLexerX lexer = new HiveLexerX(new ANTLRNoCaseStringStream(command));
    TokenRewriteStream tokens = new TokenRewriteStream(lexer);
    if (ctx != null) {
        if (viewFullyQualifiedName == null) {
            // Top level query
            ctx.setTokenRewriteStream(tokens);
        } else {
            // It is a view
            ctx.addViewTokenRewriteStream(viewFullyQualifiedName, tokens);
        }
        lexer.setHiveConf(ctx.getConf());
    }
    HiveASTParser parser = new HiveASTParser(tokens);
    if (ctx != null) {
        parser.setHiveConf(ctx.getConf());
    }
    parser.setTreeAdaptor(ADAPTOR);
    HiveASTParser.statement_return r = null;
    try {
        r = parser.statement();
    } catch (RecognitionException e) {
        throw new HiveASTParseException(parser.errors);
    }
    if (lexer.getErrors().size() == 0 && parser.errors.size() == 0) {
        LOG.debug("Parse Completed");
    } else if (lexer.getErrors().size() != 0) {
        throw new HiveASTParseException(lexer.getErrors());
    } else {
        throw new HiveASTParseException(parser.errors);
    }
    HiveParserASTNode tree = r.getTree();
    tree.setUnknownTokenBoundaries();
    return tree;
}