zetasql-toolkit-bigquery/src/main/java/com/google/zetasql/toolkit/catalog/bigquery/BigQueryCatalog.java [470:482]:
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    boolean constantExists =
        this.catalog.getConstantList().stream()
            .anyMatch(
                existingConstant -> existingConstant.getFullName().equalsIgnoreCase(fullName));

    if (constantExists) {
      throw new CatalogResourceAlreadyExists(fullName, "Constant " + fullName + "already exists");
    }

    this.catalog.addConstant(constant);
  }

  @Override
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zetasql-toolkit-core/src/main/java/com/google/zetasql/toolkit/catalog/basic/BasicCatalogWrapper.java [104:116]:
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    boolean constantExists =
        this.catalog.getConstantList().stream()
            .anyMatch(
                existingConstant -> existingConstant.getFullName().equalsIgnoreCase(fullName));

    if (constantExists) {
      throw new CatalogResourceAlreadyExists(fullName, "Constant " + fullName + "already exists");
    }

    this.catalog.addConstant(constant);
  }

  @Override
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