Examples with DefaultValueExpression org.apache.phoenix.expression.function.DefaultValueExpression used on opensource projects

Example 1 with DefaultValueExpression

use of org.apache.phoenix.expression.function.DefaultValueExpression in project phoenix by apache.

the class ColumnRef method newColumnExpression.

public Expression newColumnExpression(boolean schemaNameCaseSensitive, boolean colNameCaseSensitive) throws SQLException {
    PTable table = tableRef.getTable();
    PColumn column = this.getColumn();
    String displayName = tableRef.getColumnDisplayName(this, schemaNameCaseSensitive, colNameCaseSensitive);
    if (SchemaUtil.isPKColumn(column)) {
        return new RowKeyColumnExpression(column, new RowKeyValueAccessor(table.getPKColumns(), pkSlotPosition), displayName);
    }
    if (table.getType() == PTableType.PROJECTED || table.getType() == PTableType.SUBQUERY) {
        return new ProjectedColumnExpression(column, table, displayName);
    }
    Expression expression = table.getImmutableStorageScheme() == ImmutableStorageScheme.SINGLE_CELL_ARRAY_WITH_OFFSETS ? new SingleCellColumnExpression(column, displayName, table.getEncodingScheme(), table.getImmutableStorageScheme()) : new KeyValueColumnExpression(column, displayName);
    if (column.getExpressionStr() != null) {
        String url = PhoenixRuntime.JDBC_PROTOCOL + PhoenixRuntime.JDBC_PROTOCOL_SEPARATOR + PhoenixRuntime.CONNECTIONLESS;
        PhoenixConnection conn = DriverManager.getConnection(url).unwrap(PhoenixConnection.class);
        StatementContext context = new StatementContext(new PhoenixStatement(conn));
        ExpressionCompiler compiler = new ExpressionCompiler(context);
        ParseNode defaultParseNode = new SQLParser(column.getExpressionStr()).parseExpression();
        Expression defaultExpression = defaultParseNode.accept(compiler);
        if (!ExpressionUtil.isNull(defaultExpression, new ImmutableBytesWritable())) {
            return new DefaultValueExpression(Arrays.asList(expression, defaultExpression));
        }
    }
    return expression;
}